Custom Component Easy

Dear Everyone, Anyone, Someone
Please help me with Custom Component. I am finding it very difficult to develop a custom component. Can anybody provide me guidance on the whole procedure of creating a custom component that works perfectly.
Please it's being more then a month.
Hope you do needfull.
Regards,
Ashish Samant

Hi There,
These maybe of use to you. PLease see the section on custom components at for an example.
http://developers.sun.com/jscreator/reference/techart/2/index.jsp
Thanks
K

Similar Messages

How do I tie a custom-component to a class?

In flash there's this great way of seperating code from
content: In the properties menu of a movieclip in your library, you
can assign a class name to the movie. So something I very regularly
do is:
class MyMovieClip extends MovieClip{
//etc..
so I'd have all the code that manages my movies nicely tucked
away in some .as files, no code in the fla. That's the way I like
it.
So I was wondering if you can do a similar thing in Flex. I
most definitely don't want the code for my application in the .mxml
file, I actually want to inherit the Application class. Similarly,
I'd like to inherit the Canvas class, yet have the nice gui for
dragging all the visuall elements in place. Is there a way?
Regard, and thanks in advance,
Karel

If you look in the library panel, there should be an entry for your custom component - probably something like CustomComponent1.mxml. Drag this out onto the artboard to create a new instance of the component.
In the case of a custom component, you can't change much on the second instance. If you have something like a text input skin though, you can change the text it is displaying for each instance.
We are working on making this sort of thing easier in the future, so stay tuned

How do I reuse a custom component in Flash Catalyst?

All-
I'm sure this is easy, I simply can't figure it out. I've created a custom component in Flash Catalyst with two states, open and closed. I'd like to reuse this component in my app with different text assest. How is this done? Duplicating the component isn't available in this version...do I need to recreate the whole thing with different text?
Cheers,
`me

If you look in the library panel, there should be an entry for your custom component - probably something like CustomComponent1.mxml. Drag this out onto the artboard to create a new instance of the component.
In the case of a custom component, you can't change much on the second instance. If you have something like a text input skin though, you can change the text it is displaying for each instance.
We are working on making this sort of thing easier in the future, so stay tuned

Reset custom component

Hello!
I have an app with some states.
Each state shows a different custom component.
My problem is that if someone types somthing in one of the states then changes state and then comes back the text will still be there.
Is there a way to reintitialize the custom component on each state chage or do I have to create functions to reset everything myself?
Thank you!

Ok, thank you.
Were they only Form fileds it would have been nice and easy.
I have some AMF calls etc.
I could probably remove the component with removeChild and add it when it's accessed again I guess, but that doesn't seem too elegant.

Passing a reference / variable to a Custom Component

Hi, I was wondering if someone could help me.
It seems like a very simple problem but I cant for the life
of me seem to work out a solution.
I have created a Custom Component that extends from the
UIComponent that consists of a “rev counter” style
clock face etc….
I want to use this component multiple times within my
application – however feed it different data so for example
each “rev counter” on the page will be displaying
different data etc…..
I want to be able to reuse my component and not have to
create a new component every time I add a “rev counter”
to my application, therefore I need some way of passing a reference
/ variable to the component (maybe from the <mx /> tag where
I declare it in the MXML code ??? )
<mx:Application ….
xmlns:comps="components.*" …..>
<comps:RevCounterComp id=”” (add something
here to reference???) />
</ mx:Application>
Doing this will allow me to reuse my ONE custom component
MANY times feeding it different data (different data provaiders for
each instance of the single component)
Hope this makes sense???
Any help / advice is much appreciated,
Thanks,
Jon.

Jon,
jmryan's suggestion is the preferred way to go. This way you
can use the simple MXML syntax that you described in your post.
If your custom component is defined in ActionScript, you can
use setters or the creationComplete event to update the component
when the values are passed in from the tag (they are set *after*
your constructor runs).
Even easier, if your component is defined in MXML, you can
add [Bindable] to your public field and then bind directly to it in
the custom component's MXML code.
- Peter

How do I automate a custom component not implementing UIComponent?

I have tried using Adobe's instructions for automating custom components by creating a delegate class to use as a mixin, but
1) the super() statement in the delegate of the constructor is not recognized by the compiler,
2) I am not able to use a DisplayObject as an argument to init(),
3) I am not able to return the custom component as a IAutomationObject from the parent component's getAutomationChildAt method.
Is it simply not possible to automate a custom component not implementing UIComponent?

If you look in the library panel, there should be an entry for your custom component - probably something like CustomComponent1.mxml. Drag this out onto the artboard to create a new instance of the component.
In the case of a custom component, you can't change much on the second instance. If you have something like a text input skin though, you can change the text it is displaying for each instance.
We are working on making this sort of thing easier in the future, so stay tuned

Navigation from within a custom component ???

Hi All
I am working on a new project in Flex 4 and i have a Viewstack on my main page. Then i have 6 custom components in the viewstack, the first being the home page. In this homepage custom component i have linkbuttons which i want the user to click on to navigate the viewstack ..
So what would be the best way to do this ?
                         <fx:Script>
                              <![CDATA[
                                   ]]>
                         </fx:Script>
               <mx:ViewStack id="vs" width="800" height="1000">
                    <s:NavigatorContent width="100%">
                         <v:VHome id="vHome" />
                                        <v:VHome id="vAbout" />
                                        <v:VHome id="vShop" />
                                        <v:VHome id="vProducts" />
                                        <v:VHome id="vSupport" />
                                        <v:VHome id="vContact" />
                         </s:NavigatorContent>
               </mx:ViewStack>
<s:Group xmlns:fx="http://ns.adobe.com/mxml/2009"
           xmlns:s="library://ns.adobe.com/flex/spark"
           xmlns:mx="library://ns.adobe.com/flex/mx"
           width="100%">
     <s:layout>
          <s:VerticalLayout />
     </s:layout>
     <fx:Declarations>
          
     </fx:Declarations>
          <mx:Spacer height="10" />
          <s:Panel title="Welcome" width="100%">
          </s:Panel>
          <s:HGroup>
               <s:Panel width="397" height="200">
                    <MX:LinkButton />
               </s:Panel>
               <s:Panel width="397" height="200">
                    <MX:LinkButton />
               </s:Panel>
          </s:HGroup>
          <s:HGroup>
               <s:Panel width="397" height="200">
                    <MX:LinkButton />
               </s:Panel>
               <s:Panel width="397" height="200">
                    <MX:LinkButton />
               </s:Panel>
          </s:HGroup>
          <s:HGroup>
               <s:Panel width="397" height="200">
                    <MX:LinkButton />
               </s:Panel>
               <s:Panel width="397" height="200" >
                    <MX:LinkButton />
               </s:Panel>
          </s:HGroup>
</s:Group>
Many Thanks

If I am understanding this correctly, you have three choices.
1. Do something like ViewStack.selectedIndex(id of tab in viewstack), but not sure if selectedIndex is correct but whatever the method name is.
2. Fire an event and set up listeners
3. Go with a framework and use its notifications or event system
If this is a production app I suggest fighting the urge to go the easy route and use a framework as before you know it you will in the middle of spaghetti code.

Instantiating a Custom Component

I am somewhat new to this concept and I keep thinking about
things the ActionScript 2 way where we can say:
createObject(refObject,instanceName,depth,constructorObject);
I am instantiating custom MXML components using a technique
similar to the following:
var classRef:Class =
flash.utils.getDefinitionByName("Components."+module) as Class;
var d:DisplayObject = new classRef() as DisplayObject;
mainCanvas.addChild(d);
where mainCanvas is a Canvas component on my main stage and d
is a reference to the custom component attached to the mainCanvas.
My question is what is the best practice means to pass data
to d such that it will be available upon instantiation. I am
looking to employ the constructor object concept from attachMovie
and createObject of AS 2.
Thanks in advance

Look up ClassFactory - but what you are doing isn't very
Flex-ish. The better way is to do:
var d:Whatever = new Whatever();
d.property1 = value;
d.property2 = value;
mainCanvas.addChild(d);
This is the way we do it within the Flex framework and is
pretty easy to understand. You might also want to look up the
commitProperties function and override that in your custom
component in case you need to combine or use your property values
while your component is initializing.

Scaling a Custom Component? (pressing a button)

"To resize a custom component, edit the components content"
Does that mean edit in Photoshop?? I can't find anywhere to scale the object. I have a button and I want it to scale down as I press it...
I basically want an easy way to make an image into a button that looks depressed or something when you click it...

It means to edit the component in Catalyst.
For example:
1) Draw a Rectangle
2) Choose the Arrow tool. Right-clck on Rectangle and choose Convert Artwork to Component > Button
3) With the Button selected, notice that the HUD displays "Edit Button Appearance" with Up, Down, Over, and Disabled choices. Choose one.
Or, you can double-click on the Button.
4) In either case, you will enter what is called Edit-in-Place mode, where you are now editing the definition of the Button.
5) You can use the Catalyst drawing tools to change the Button so that it looks different in the Up and Down states.
6) Use the bread crumb bar above the ArtBoard to exit Edit-in-Place mode, or double-click outside the Button.
Hope this helps,
-- Greg

Clarifications on Custom component in adobe LC

Hi,
I am new to custom component. I just know when a desired result is not provided by stadard activities by adobe lc then we need to create custom components.
1.Could anyone post me a small sample.
2.How to use it in adobe lc as acitivity to get desired result.
3.I have used invoke web services activity to get the result but what is other way to build a custom component.
4.if i have a java class. which accept input parameters and results into some output. How do i use this java class as custom object.
if possible please post study material on this.
thanks in advance
regards
Sunil Gupta

My first bit of advice would be to get the DSC development plugin from Labs. It will make your development and deployment much easier
http://labs.adobe.com/technologies/lcwcdtool/
The official documentation is pretty good around DSCs:
http://help.adobe.com/en_US/livecycle/9.0/programLC/help/index.htm?content=001404.html
I wrote a couple of articles on DSC development ages ago. Its a bit out of date (before the tooling was available) but it may help you with the basics:
http://www.adobe.com/devnet/livecycle/articles/dsc_development.html
http://www.adobe.com/devnet-archive/livecycle/articles/dsc_development_pt2.html

Stumped with a custom component. Can anyone help?

I'm working on a component that I would like to have 3 dream levels plus limbo.
Oh wait, sorry...I'm mixed up. Though I do feel my issue is equally contrived and at times, frustrating to wrap my head around.
What I REALLY would like, is to make a custom component that does indeed have 3 levels, and I'm having issues with mouseover. My goal, Is to have a menu of several items, each a custom component. When a component is clicked, it "opens" into a similar menu of additional components, which in turn can be hovered over to display an image. That seems to be the easy part.
I have created each second level item (blue), that upon mouseover displays an image (green). I have combined all of those into a single custom component, (red) and made individual states for the overall component that 1) displays ONLY the red button and 2) displays the blue components with the red component disabled.
What I can't figure out is how to make ONLY the (red) item appear for mouseover and click when in the top state. What is happening at the moment is that as far as the browser is concerned, the entire component is the mouseover area. This makes it impossible to put multiple (red) items next to each other.
I've tried making the (blue) and (green) components hidden and/or disabled, but it does not seem to effect the problem. I can't make those items not "accept mouseover" because the (blue) items are in turn supposed to be buttons used to display the end (green) image.
Does anyone know what I can do to solve this problem? I hope I was able to describe the situation well enough. Like I said....it's kind of stupid and contrived.

WELL. After typing that whole deal out, I seem to have come across the solution myself, and it's ridiculously simple, and makes me feel the same for not figuring it out right away.
Much like everything else in Catalyst, the "accepts mouse events" can be changed for the same object in different states. So what you do is uncheck the "accepts..." box for each item while in the top state, and check it once more in the lower states. Also, the "Transparency accepts mouse" needs to be unchecked.
Simple.

Dispatching & listening for custom events from custom component [Flex 4.1]

I'm giving this a try for the first time and I'm not sure I have the recipe correct!
I have a custom component - it contains a data grid where I want to double click a row and dispatch an event that a row has been chosen.
I created a custom event
package oss
    import flash.events.Event;
    public class PersonChosenEvent extends Event
        public function PersonChosenEvent(type:String, bubbles:Boolean=false, cancelable:Boolean=false)
            super(type, bubbles, cancelable);
        // Define static constant.
        public static const PERSON_CHOSEN:String = "personChosen";
        // Define a public variable to hold the state of the enable property.
        public var isEnabled:Boolean;
        // Override the inherited clone() method.
        override public function clone():Event {
            return new PersonChosenEvent(type);
Then I try to dispatch the event within the component when the datagrid is doubleclicked:
import oss.PersonChosenEvent
dispatchEvent(new PersonChosenEvent(PersonChosenEvent.PERSON_CHOSEN, true, false));
And in the parent application containing the component I do on creationComplete
addEventListener(PersonChosenEvent.PERSON_CHOSEN,addPersonToList);
The event does not seem to fire though. And if I try to evaluate the "new PersonChosenEvent(..." code it tells me "no such variable".
What am I doing wrong?
(It was so easy in VisualAge for Java, what have we done in the last 10 years?? )
Martin

I've done this kind of thing routinely, when I want to add information to the event. I never code the "clone" method at all.
Be sure that you are listening to the event on a parent of the dispatching component.
You can also have the dispatching component listen for the event too, and use trace() to get a debug message.
I doubt if it has anything to to with "bubbles" since the default is true.
Sample code
In a child (BorderContainer)
dispatchEvent(new ActivationEvent(ActivationEvent.CREATION_COMPLETE,null,window));
In the container parent (BorderContainer)
activation.addEventListener(ActivationEvent.CREATION_COMPLETE,activationEvent);
package components.events
    import components.containers.SemanticWindow;
    import components.triples.SemanticActivation;
    import flash.events.Event;
    public class ActivationEvent extends Event
        public static const LOADED:String = "ActivationEvent: loaded";
        public static const CREATION_COMPLETE:String = "ActivationEvent: creation complete";
        public static const RELOADED:String = "ActivationEvent: reloaded";
        public static const LEFT_SIDE:String = "ActivationEvent: left side";
        public static const RIGHT_SIDE:String = "ActivationEvent: right side";
        private var _activation:SemanticActivation;
        private var _window:SemanticWindow;
        public function ActivationEvent(type:String, activation:SemanticActivation, window:SemanticWindow)
            super(type);
            _activation = activation;
            _window = window
        public function get activation():SemanticActivation {
            return _activation;
        public function get window():SemanticWindow{
            return _window;

Importing a custom component from Flash Catalyst with Assets

I am experimenting with Flash Catalyst to see if it would work well for us to create components for Flash Builder to use. As a test I created a very simple component with a Pie Chart and a button and exported it as a fxpl file. In Flash Builder I created a Flex library project and imported the component to it. When I tried to use the component in a trivial test app it gave me an error, saying 'Could not resolve <graphics:fc_pie> to a component implementation', presumably because it had not put the component files in the right place of the library tree - by default they were put in a folder at the same level as components but with the name of the component, below which it had a components folder and an assets folder. If I move the files in these folders to the corresponding folders under src then it works fine.
The question is, how do I get Flash Builder to do this correctly? I assume I'm missing something obvious but I am a real Flash Builder Novice and this process is about evaluating which tools to use. Sorry if I'm being a numpty. I'm using Flash builder 4.5 and Flash Catalyst CS5.5.
Any help much appreciated.

If you look in the library panel, there should be an entry for your custom component - probably something like CustomComponent1.mxml. Drag this out onto the artboard to create a new instance of the component.
In the case of a custom component, you can't change much on the second instance. If you have something like a text input skin though, you can change the text it is displaying for each instance.
We are working on making this sort of thing easier in the future, so stay tuned

Problem with inputText in my custom component

Hi, I have a custom dataTable component that I'm trying to get to work. It has to be a custom component because dataTable doesn't support rowspan, colspan, multi line headers, and a rendered attribute for rows. The problem is, that when I wrap the column tag inside my row tag then the method for the inputText tag never gets called in the UPDATE_MODEL_VALUES phase.
I'm starting to think that JSF doesn't support 2 levels of tags between the inputText and dataTable. I'm hoping that someone can tell me what I have wrong with my components.
Here is the JSP snippet.
<cjsf:rptTable>
     <cjsf:data id="dataTable1" value="#{allAuthUser.tableRows}" var="myTableRow1">
          <cjsf:row>
               <cjsf:col>
                    <h:inputText id="tableTestFld" value="#{myTableRow1.testFld}" size="5" maxlength="5"/>
               </cjsf:col>
          </cjsf:row>
     </cjsf:data>
</cjsf:rptTable>Here is what it renders. It looks to me like everything renders fine. So I'm guessing that there is something in a component that is causing JSF during the life cycle to not be able to process correctly.
<table>
     <tbody>
          <tr>
               <td><input id="tblmaintForm:body:dataTable1_0:tableTestFld" name="tblmaintForm:body:dataTable1_0:tableTestFld" type="text" value="" maxlength="5" size="5"/></td>
          </tr>
          <tr>
               <td><input id="tblmaintForm:body:dataTable1_1:tableTestFld" name="tblmaintForm:body:dataTable1_1:tableTestFld" type="text" value="" maxlength="5" size="5"/></td>
          </tr>
          <tr>
               <td><input id="tblmaintForm:body:dataTable1_2:tableTestFld" name="tblmaintForm:body:dataTable1_2:tableTestFld" type="text" value="" maxlength="5" size="5"/></td>
          </tr>
     </tbody>
</table>Note: If I leave off the row tag it renders the same way except of course the <tr> and </tr> tags are missing. If I do this, then the backing method for the inputText tag is called and everything works fine. Why doesn't it work with the row tag in place?
Here are the components:
public class UIRptTable extends UIComponentBase {
     public UIRptTable() {
          setRendererType("tblmaint.rptTableRenderer");
     public String getFamily() {
          return "javax.faces.Output";
public class UIRptTableData extends HtmlDataTable {
     public UIRptTableData() {
          setRendererType("tblmaint.rptTableDataRenderer");
     public String getFamily() {
          return "javax.faces.Data";
public class UIRptTableRow extends UIOutput {
     public UIRptTableRow() {
          setRendererType("tblmaint.rptTableRowRenderer");
     public String getFamily() {
          return "javax.faces.Output";
public class UIRptTableCol extends UIColumn {
     public UIRptTableCol() {
          setRendererType("tblmaint.rptTableColRenderer");
     public String getFamily() {
          return "javax.faces.Column";
}Here is part of the faces-config file in case you need it.

<component>
     <component-type>tblmaint.rptTable</component-type>
     <component-class>com.monsanto.ag_it.fieldops.aim.tblmaint.component.UIRptTable</component-class>
</component>
<component>
     <component-type>tblmaint.rptTableData</component-type>
     <component-class>com.monsanto.ag_it.fieldops.aim.tblmaint.component.UIRptTableData</component-class>
</component>
<component>
     <component-type>tblmaint.rptTableRow</component-type>
     <component-class>com.monsanto.ag_it.fieldops.aim.tblmaint.component.UIRptTableRow</component-class>
</component>
<component>
     <component-type>tblmaint.rptTableCol</component-type>
     <component-class>com.monsanto.ag_it.fieldops.aim.tblmaint.component.UIRptTableCol</component-class>
</component>

<render-kit>
     <renderer>
          <component-family>javax.faces.Output</component-family>
          <renderer-type>tblmaint.rptTableRenderer</renderer-type>
          <renderer-class>com.monsanto.ag_it.fieldops.aim.tblmaint.renderer.RptTableRenderer</renderer-class>
     </renderer>
</render-kit>
<render-kit>
     <renderer>
          <component-family>javax.faces.Data</component-family>
          <renderer-type>tblmaint.rptTableDataRenderer</renderer-type>
          <renderer-class>com.monsanto.ag_it.fieldops.aim.tblmaint.renderer.RptTableDataRenderer</renderer-class>
     </renderer>
</render-kit>
<render-kit>
     <renderer>
          <component-family>javax.faces.Output</component-family>
          <renderer-type>tblmaint.rptTableRowRenderer</renderer-type>
          <renderer-class>com.monsanto.ag_it.fieldops.aim.tblmaint.renderer.RptTableRowRenderer</renderer-class>
     </renderer>
</render-kit>
<render-kit>
     <renderer>
          <component-family>javax.faces.Column</component-family>
          <renderer-type>tblmaint.rptTableColRenderer</renderer-type>
          <renderer-class>com.monsanto.ag_it.fieldops.aim.tblmaint.renderer.RptTableColRenderer</renderer-class>
     </renderer>
</render-kit>I sure hope that someone can help me out. Please let me know if you need any additional information.
Thanks,
Ray

Hi, Ray!
1) I was trying to put a button in the column header (for sorting) and I couldn't get that to work. That involved the >colhdr tag. I got that to work but I don't remember the fix. I'll look it up and reply back with that when I can.Dealing the first part of your trouble, you need NOT a custom component.
I have looked through the implementation of RepeaterRenderer, as you advised me, and found that the multi-header possibility is included in the implementation of dataTable control.
The code below is the part of source of repeater.jsp with only change:
<d:data_repeater>  <h:dataTable>
And it works fine.
<h:dataTable id="table"
binding="#{RepeaterBean.data}"
     rows="5"
value="#{RepeaterBean.customers}"
var="customer">
<f:facet name="header">
<h:outputText value="Customer List"/>               <!� First Header row -- >
</f:facet>
<h:column>
<%-- Visible checkbox for selection --%>
<h:selectBooleanCheckbox
id="checked"
binding="#{RepeaterBean.checked}"/>
<%-- Invisible checkbox for "created" flag --%>
<h:selectBooleanCheckbox
id="created"
binding="#{RepeaterBean.created}"
rendered="false"/>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="Account Id"/>               <!�Second Header row -- >
</f:facet>
<h:inputText id="accountId"
binding="#{RepeaterBean.accountId}"
required="true"
size="6"
value="#{customer.accountId}">
</h:inputText>
<h:message for="accountId"/>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="Customer Name"/>               <!�Second Header row -- >
</f:facet>
<h:inputText id="name"
required="true"
size="50"
value="#{customer.name}">
</h:inputText>
<h:message for="name"/>
</h:column>
<h:column>
<f:facet name="header">                    <!�Second Header row -- >
<h:outputText value="Symbol"/>
</f:facet>
<h:inputText id="symbol"
required="true"
size="6"
value="#{customer.symbol}">
<f:validateLength
maximum="6"
minimum="2"/>
</h:inputText>
<h:message for="symbol"/>
</h:column>
<h:column>
<f:facet name="header">                    <!�Second Header row -- >
<h:outputText value="Total Sales"/>
</f:facet>
<h:outputText id="totalSales"
value="#{customer.totalSales}">
<f:convertNumber
type="currency"/>
</h:outputText>
</h:column>
<h:column>
<f:facet name="header">                    <!�Second Header row -- >
<h:outputText value="Commands"/>
</f:facet>
<h:commandButton id="press"
action="#{RepeaterBean.press}"
immediate="true"
value="#{RepeaterBean.pressLabel}"
type="SUBMIT"/>
<h:commandLink id="click"
action="#{RepeaterBean.click}"
immediate="true">
<h:outputText
value="Click"/>
</h:commandLink>
</h:column>
</h:dataTable>
You may have a look at HTML source to prove that dataTable is already what you need:
<table id="myform:table">
<thead>
<tr><th colspan="6" scope="colgroup">Customer List</th></tr>
<tr>
<th scope="col"></th>
<th scope="col">Account Id</th>
<th scope="col">Customer Name</th>
<th scope="col">Symbol</th>
<th scope="col">Total Sales</th>
<th scope="col">Commands</th>
</tr>
</thead>
<tbody>
2.) The second trouble is still unsettled as previously. Right now I have different task at my job, and I can�t continue investigation of this problem.
But when you find smth., please let me know. I�ll be very grateful.
Regards,
Oleksa Stelmakh

Unable to Edit the View in Custom Component

Hi Experts,
Please help me to resolve this issue !
I am unable to lock the BOL Entity in my custom component using BTAdminH. I have written the below code in the Edit event Handler for Edit Button. The lr_entity->lock( ) condition statement is getting false and it is skipping the "set_view_editable( me )." code statement. Why??
This is code excerpt that I have taken from edit button of the BP_HEAD/AccountViewSet and altered to my component/View
DATA: lr_entity     TYPE REF TO cl_crm_bol_entity,
        lr_controller TYPE REF TO cl_ZVKH8_bspwdcomponent_impl.
TRY.
      lr_controller ?= me->comp_controller.
      lr_entity ?= lr_controller->typed_context->btadminh->collection_wrapper->get_current( ).
IF lr_entity IS BOUND.
IF lr_entity->IS_LOCKED EQ abap_false.
    IF le_entity->IS_CHANGEABLE EQ abap_true.
       IF lr_entity->lock( ) EQ abap_true.
        me->view_group_context->set_view_editable( me ).
       ENDIF.
    ENDIF.
ENDIF.
ENDIF.
and when I directly executed the below code in the Edit event Handler for Edit Button I am receiving the dereferencing NULL value exception. Why in my custom component in many places this happening??
me->view_group_context->set_view_editable( me ).
Exception Details
CX_SY_REF_IS_INITIAL - Dereferencing of the NULL reference
Method: ZL_ZVKH8_DETAILSEF_IMPL=>EH_ONBACK
Thanks,
Bujji

Hi Summit & NishaNC,
Thanks for your responses !
As suggested, I have debugged the code for ->lock( ) method and there are exceptions raised from some methods.
Method GET_LOCK () -> Method GET_ROOT () ->Method GET_PARENT ()
At GET_ROOT( ) method i have received an exception
"Root entity BTAdminH could not be determined" and one more "Entity BTAdminH could not be locked"
Later when I have checked in MODEL Browser, I found that the BOL object "BTAdminH" for my view is an Access object and not the Root Object.
Hence, I have a question? Does the locking can be done only for ROOT Objects?
If this is TRUE then I think this is the major problem with my custom component where even the cross component navigation is also not happening and in many places I am receiving "Dereferencing NULL Value" information.
Also I have gone through some of the Threads and one information that I found from Sumit Mittal
1. An access object is an independent entity, has primary keys of its own.
2. A root object is a special access object that is at the top of the hierarchy based on business rules.
3. A dependent object's primary keys are supplied by access objects and it's lifetime is bound to them. If the parent object is destroyed, the dependent object is also destroyed.
4. Search objects are query objects useful for querying root objects
5. Search result objects - Search objects return the results in the form of a result object together with a relation pointing to the root object.
6. View objects - ?
7. Dynamic search objects - Used in advanced search, supports ranges and operators
Could you please specify in which scenarios we have to go for Access Objects and Root Objects
Thanks,
Bujji

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