Item rendering order

I have a button region which displays various different buttons depending on the values of page level items.
The button region was originally in region position 'Page Template Body (2)' and it was working fine. I am now attempting to move the button region into 'Region Position 8' and now the buttons don't show up (the region is displayed)
in the page template Region Position 8 has been defined in a div of its own above the #BOX_BODY# as such
<div>
#REGION_POSITION_08#
</div>
<div class="t10messages">#GLOBAL_NOTIFICATION##SUCCESS_MESSAGE##NOTIFICATION_MESSAGE#</div>
#BOX_BODY##REGION_POSITION_05##REGION_POSITION_06##REGION_POSITION_07#any idea as to why the buttons are no longer able to read the page level items and how i can get round this??

I would try the following things to troubleshoot
1. Make the button render unconditionally
2. Run the page in debug mode to see what the rendering engine does

Similar Messages

Overriding Spark DataGrid item renderer's prepare method - renderer's child is initially null

I am currently using the 4.12.0 SDK. I have a Spark DataGrid setup that makes use of an externally-defined itemRenderer:
<s:DataGrid id="dgEquipment"
            width="100%" height="100%"
            doubleClickEnabled="true"
            creationComplete="init()" doubleClick="popTab(event)">
<s:columns>
    <s:ArrayList>
      <s:GridColumn itemRenderer="renderers.equipment.IconRenderer"
                    dataField="EXISTING"
                    width="22"/>
The data provider is set programmatically after a remote call has returned a result.
I have the renderer setup as follows:
<?xml version="1.0" encoding="utf-8"?>
<s:GridItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009"
                    xmlns:s="library://ns.adobe.com/flex/spark"
                    xmlns:mx="library://ns.adobe.com/flex/mx"
                    dataChange="init()" remove="dispose()">
<s:layout>
    <s:VerticalLayout horizontalAlign="center" verticalAlign="middle"/>
</s:layout>
<fx:Script>
    <![CDATA[
      import mx.controls.Menu;
      import mx.events.MenuEvent;
      import spark.components.DataGrid;
      [Bindable]
      [Embed(source="../../../assets/images/Icon 1.png")]
      private var ico1:Class;
      [Bindable]
      [Embed(source="../../../assets/images/Icon 2.png")]
      private var ico2:Class;
      [Bindable]
      [Embed(source="../../../assets/images/Icon 3.png")]
      private var ico3:Class;
      private var isExisting:Boolean;
      private var popUp:Menu;
      private function init():void
        if (data)
          isExisting = data.EXISTING == 1;
      private function dispose():void
        if (popUp)
          popUp.removeEventListener(MenuEvent.ITEM_CLICK, popUp_click);
          popUp = null;
        if (imgActions)
          imgActions.removeEventListener(MouseEvent.CLICK, image_click);
          imgActions = null;
      override public function prepare(hasBeenRecycled:Boolean):void
        if (data)
          if ((data.TYPE == "A" || data.TYPE == "B") && !data.X && !data.Y)
            disableLink();
            imgActions.source = ico3;
            imgActions.toolTip = "Blah blah.";
          else if (data.TYPE == "C" || data.TYPE == "D")
            disableLink();
          else if (isExisting)
            imgActions.source = ico1; //******************************            imgActions.toolTip = "More blah blah.";
            imgActions.addEventListener(MouseEvent.CLICK, image_click);
          else
            imgActions.source = ico2;
            imgActions.addEventListener(MouseEvent.CLICK, image_click);
            imgActions.toolTip = "Even more blah blah.";
            initPopUp();
      private function initPopUp():void
      private function popUp_click(event:MenuEvent):void
      private function image_click(event:MouseEvent):void
      private function disableLink():void
    ]]>
</fx:Script>
<s:Image id="imgActions"
           height="18" width="18"/>
</s:GridItemRenderer>
When the code reaches the line where I have added a comment full of asterisks, I get the following error:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
    at renderers.equipment::IconRenderer/prepare()[C:\…\renderers\equipment\IconRenderer.mxml:81 ]
    at spark.components.gridClasses::GridViewLayout/initializeItemRenderer()[/Users/justinmclean /Documents/ApacheFlex4.12.0/frameworks/projects/spark/src/spark/components/gridClasses/Gri dViewLayout.as:1808]
    at spark.components.gridClasses::GridViewLayout/createTypicalItemRenderer()[/Users/justinmcl ean/Documents/ApacheFlex4.12.0/frameworks/projects/spark/src/spark/components/gridClasses/ GridViewLayout.as:1243]
    at spark.components.gridClasses::GridViewLayout/updateTypicalCellSizes()[/Users/justinmclean /Documents/ApacheFlex4.12.0/frameworks/projects/spark/src/spark/components/gridClasses/Gri dViewLayout.as:1374]
    at spark.components.gridClasses::GridViewLayout/measure()[/Users/justinmclean/Documents/Apac heFlex4.12.0/frameworks/projects/spark/src/spark/components/gridClasses/GridViewLayout.as: 875]
    at spark.components.supportClasses::GroupBase/measure()[/Users/justinmclean/Documents/Apache Flex4.12.0/frameworks/projects/spark/src/spark/components/supportClasses/GroupBase.as:1156 ]
    at mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::measureSizes()[/Users/justinmclean/Documents/ApacheFlex4.12.0/frameworks/projects/framework/src/mx/cor e/UIComponent.as:9038]
    at mx.core::UIComponent/validateSize()[/Users/justinmclean/Documents/ApacheFlex4.12.0/framew orks/projects/framework/src/mx/core/UIComponent.as:8962]
    at spark.components::Group/validateSize()[/Users/justinmclean/Documents/ApacheFlex4.12.0/fra meworks/projects/spark/src/spark/components/Group.as:1074]
    at mx.managers::LayoutManager/validateSize()[/Users/justinmclean/Documents/ApacheFlex4.12.0/ frameworks/projects/framework/src/mx/managers/LayoutManager.as:673]
    at mx.managers::LayoutManager/doPhasedInstantiation()[/Users/justinmclean/Documents/ApacheFl ex4.12.0/frameworks/projects/framework/src/mx/managers/LayoutManager.as:824]
    at mx.managers::LayoutManager/doPhasedInstantiationCallback()[/Users/justinmclean/Documents/ ApacheFlex4.12.0/frameworks/projects/framework/src/mx/managers/LayoutManager.as:1188]
Running the debugger shows that this occurs with the first item in the data provider. If I alter the prepare method to check for the existence of imgActions before doing anything, everything works fine after the first item. So I'll have one row in the DataGrid with a missing icon, and all the rest will have icons.
So the question is, is it normal for prepare to run before any children of the item renderer are created? If so, how should I handle this?
Many thanks in advance.

A little more info. I added some event handlers to the renderer and the image (for events that I thought would be relevant), and here is the order of events based on trace statements within the handlers:
griditemrenderer1_addedHandler
griditemrenderer1_addedToStageHandler
griditemrenderer1_preinitializeHandler
imgActions_addedHandler
griditemrenderer1_addedHandler
imgActions_addedToStageHandler
imgActions_preinitializeHandler
imgActions_addedHandler
griditemrenderer1_addedHandler
imgActions_initializeHandler
griditemrenderer1_elementAddHandler
imgActions_addHandler
griditemrenderer1_initializeHandler
griditemrenderer1_addHandler
prepare called
imgActions_resizeHandler
griditemrenderer1_resizeHandler
imgActions_creationCompleteHandler
imgActions_updateCompleteHandler
griditemrenderer1_creationCompleteHandler
griditemrenderer1_updateCompleteHandler
griditemrenderer1_removeHandler
griditemrenderer1_addedHandler
griditemrenderer1_addedToStageHandler
imgActions_addedToStageHandler
griditemrenderer1_addHandler
griditemrenderer1_dataChangeHandlerTypeError: Error #1009: Cannot access a property or method of a null object reference.
prepare called
    at renderers.equipment::IconRenderer/prepare()[C:\…\renderers\equipment\IconRenderer.mxml:91 ]
imgActions_renderHandler
griditemrenderer1_renderHandler

ColumnChart - 3D Item Renderer problem

I'm building a 3D column chart and am finding that I need to
draw the columns in a specific order other than the default, which
appears to be by series.
Things go just fine until the z-order depth is greater than
the distance between the series. Once that occurs, the potential
exists for things to go south.
To demonstrate the issue, I've put a few screenshots here:
3D Column Chart
Images
My question: Is there a way to define, or otherwise take over
the drawing order of the ColumnSeriesItems? I want to draw the
columns in the order they appear from left to right, but Flex seems
to want to draw by order of series - first Series1, then Series2,
then Series3, etc.
I'm looking through the Framework source code, but I haven't
found a way around this - yet. Of course, if there's another
approach, like using some clipping method I'm not aware of, etc,
please feel free to clue me in.
Thanks in advance to anyone with useful info.

Thanx for reply.But this is not what i am looking for.I need
to apply different colors for each bars.I am generating charts
dynamically.The item renderer is working fine.But at specific
condition the item renderer shold ne removed from the chart series

Any Help ? My Item Renderer fails with Reference Error: Error #1069:

So I have a basic inline dropdownbox itemrenderer as shown below, But after I click it and select a value I get an error "ReferenceError: Error #1069: Property TELEPH_USE_TYPE_DESC not found". I am guessing I am referencing something incorrectly. Any Ideas
Code
<mx:AdvancedDataGridColumn dataField="TELEPH_USE_TYPE_DESC" editorDataField="TELEPH_USE_TYPE_DESC">
    <mx:itemEditor>
        <fx:Component>            <s:MXAdvancedDataGridItemRenderer focusEnabled="true" height="22">
                <s:DropDownList                     id="dd"
                    top="5"
                    left="5"
                    labelField="TELEPH_USE_TYPE_DESC"                   selectedItem="{data.TELEPH_USE_TYPE_DESC}"                   dataProvider="{parentDocument.tpUseAc}" />            </s:MXAdvancedDataGridItemRenderer>         </fx:Component>
    </mx:itemEditor></mx:AdvancedDataGridColumn>

TELEPH_USE_TYPE_DESC is a field on the data object, but not a property on the item renderer which is defined within the mx:itemEditor tag.
You could add something like
<mx:Script>
<![CDATA[
    public function get newValue():Object
         return dd.selectedItem.TELEPH_USE_TYPE_DESC;
\]\]\>
</mx:Script>
And change the editorDataField to “newValue”

Problem with checkbox item renderer in datagrid

I have a data grid having check box as an item renderer. I have viewed many posts in this forum but nothing useful in my case. I am failed to bind my datagrid itemrenderer checkbox with the field of dataprovider i.e. listUnitMovement.CHECK_PATH. Then I have to traverse data provider to check which checkboxes are checked.
[Bindable]
var listUnitMovement:XMLList=null;
In a function call
public function init(event:ResultEvent):void
    listUnitMovement=event.result.unitmovement;
     <mx:DataGrid id="dg_country"
                           dataProvider="{listUnitMovement}"
                              enabled="true">
                            <mx:columns>
                               <mx:DataGridColumn>
                                    <mx:itemRenderer>
                                        <mx:Component>
                                            <mx:CheckBox selectedField="CHECK_PATH" />
                                        </mx:Component>
                                    </mx:itemRenderer>
                                </mx:DataGridColumn>
                                <mx:DataGridColumn headerText="Latitude" dataField="NEW_LAT" visible="false"/>
                                <mx:DataGridColumn headerText="Longitude" dataField="NEW_LONG" visible="false"/>
                               <mx:DataGridColumn>
                                    <mx:itemRenderer>
                                        <mx:Component>
                                            <mx:Button label="Details"/>
                                        </mx:Component>
                                    </mx:itemRenderer>
                                </mx:DataGridColumn>
                            </mx:columns>
                        </mx:DataGrid>

Hi,
Do you want to just check/uncheck the checkboxes based on the CHECK_PATH field.
Do you want something like this...
<?xml version="1.0" encoding="utf-8"?><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:Script>
<![CDATA[
import mx.collections.ArrayCollection;[
Bindable]
private var listUnitMovement:ArrayCollection = new ArrayCollection([{CHECK_PATH:true,NEW_LAT:109.233,NEW_LONG:232.22},{CHECK_PATH:true,NEW_LAT:109.233,NEW_LONG:232.22},{CHECK_PATH:false,NEW_LAT:133.233,NEW_LONG:702.22}]);]]>
</mx:Script>
<mx:DataGrid dataProvider="{listUnitMovement}">
<mx:columns>
<mx:DataGridColumn>
<mx:itemRenderer>
<mx:Component>
<mx:CheckBox selectedField="CHECK_PATH" change="data.CHECK_PATH=selected" />
</mx:Component>
</mx:itemRenderer>
</mx:DataGridColumn>
<mx:DataGridColumn dataField="NEW_LAT"/>
<mx:DataGridColumn dataField="NEW_LONG"/>
</mx:columns>
</mx:DataGrid>
</mx:Application>
Please let me know clearly what's your problem...Do you want to just bind the check box based on XmlList or something else..?
Thanks,
Bhasker Chari.S

How to overlap datagrid colums line with item renderer

Hello guys I been stuck for a few days now and I'm wondering if there is a better way to do this.
I put an item renderer on a column of the datagrid. The renderer basically expands the column height and shows some controls.
Im using a border container as the container that is holding the items in the grid. However what I would like to do is make the border container as big as the grid with a plus sign button. and then basically hide that rows vertical grid lines.
i tried setting the depth eventhought i understant this is not a spark grid i though it should work but it does not. Any tip or direction would be greatly appreciated.
Miguel

ok i answered my own question. what i need to do is use the advance datagrid. Then set these properties.
<mx:AdvancedDataGrid defaultLeafIcon="{null}"
                         folderClosedIcon="{null}"
                         folderOpenIcon="{null}"
                         disclosureClosedIcon="@Embed(source='assets/plusSign.png')"
                         disclosureOpenIcon="@Embed(source='assets/plusSign.png')">
Message was edited by: miguel8312

How do you measure performance of an item renderer?

I'm creating an ItemRenderer in Flex 4.6 and I want to know how to measure total time to create, view and render an item renderer and how long it takes to view and render that item renderer when it's being reused.
I just watched the video, Performance Tips and Tricks for Flex and Flash Development and it describes the creation time, validation time and render time and also the reset time. This is described at 36:43 and 40:25.
I'm looking for a way to get numbers in milliseconds for total item renderer render time and reset time (what is being done in the video).

To answer your first question, in this video Ryan Frishberg recommends measuring and tuning your code. I'm trying to follow his example for my own item renderers.
I've taken some key slides out to show you.

Using a bitmap object as a item renderer in a datagrid

I have a UIComponent grabbed has a bitmap, and stored in an
array collection.
I want to display a thumbnail in a datagrid, I can make a
itemRenderer for an image with a local or remote file as a source.
But how do I use the bitmap in the array collection in an item
renderer.
Thanks
Dean

Here is an example with a HorizontalList:
<?xml version="1.0" ?>

<mx:VBox xmlns:mx="
http://www.adobe.com/2006/mxml"
horizontalAlign="center"
verticalGap="0" borderStyle="none" backgroundColor="white"
>
<mx:Image id="image" width="60" height="60"
source="{data.image}"/>
<mx:Label text="{data.name}" width="120"
textAlign="center"/>
<mx:Label text="${data.price}" fontWeight="bold"/>
</mx:VBox>
<?xml version="1.0"?>

<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml">
<mx:Model id="catalog" source="catalog.xml"/>
<mx:HorizontalList id="myList"
columnWidth="125"
rowHeight="125"
columnCount="4"
dataProvider="{catalog.product}"
itemRenderer="myComponents.Thumbnail"/>
<mx:LinkButton label="Product images courtesy of Lavish"
click="navigateToURL(new URLRequest('
http://www.shoplavish.com'),
'_blank')"/>
</mx:Application>
<?xml version="1.0"?>
<catalog>
<product id="1">
<name>USB Watch</name>
<price>129.99</price>
<image>assets/products/usbwatch.jpg</image>
<thumbnail>assets/products/usbwatch_sm.jpg</thumbnail>
</product>
<product id="2">
<name>007 Digital Camera</name>
<price>99.99</price>
<image>assets/products/007camera.jpg</image>
<thumbnail>assets/products/007camera_sm.jpg</thumbnail>
</product>
<product id="3">
<name>2-Way Radio Watch</name>
<price>49.99</price>
<image>assets/products/radiowatch.jpg</image>
<thumbnail>assets/products/radiowatch_sm.jpg</thumbnail>
</product>
<product id="4">
<name>USB Desk Fan</name>
<price>19.99</price>
<image>assets/products/usbfan.jpg</image>
<thumbnail>assets/products/usbfan_sm.jpg</thumbnail>
</product>
<product id="5">
<name>Caffeinated Soap</name>
<price>19.99</price>
<image>assets/products/soap.jpg</image>
<thumbnail>assets/products/soap_sm.jpg</thumbnail>
</product>
<product id="6">
<name>Desktop Rovers</name>
<price>49.99</price>
<image>assets/products/rover.jpg</image>
<thumbnail>assets/products/rover_sm.jpg</thumbnail>
</product>
</catalog>

Data provider problem in custom item renderer

I have a complex, custom item renderer for a list. I add
items that I extracted from an xml to the data provider using the
IList interface. But when displaying the list, the items are all
screwed up. Each rendered item has some parts which are initialized
as different components depending on the values from the xml. This
initialization is called in the item renderer for the
creationComplete event.
The weird thing is that when I output the dataProvider to
check its values, some of the items have internal uids sometimes
and sometimes they don't. If I output the dataProvider right after
I add the items to it, none of them get internal uids. But from the
initialize method, some of them do and some don't.
To make things weirder, sometimes, as I scroll up and down
the list, the dynamic components get all switched up. I'm either
having a problem with internal uids or with the creation policies
for lists. Or it's probably some simpler mistake I have yet to see.
Anyone have any idea where the problem could lie? Any help is
greatly appreciated.

Any successful render must:
1) override the set data property of the component
Further, best practice is to store any data you need in the
override set data(), and call invalidateProperties(). Then do the
actual work in an override commitProperties() function.
The framework is smart about when to call commitProperties
efficiently. set data() gets called much more often.
Tracy

Getting the value of a checkbox in an item renderer?

I have a list that uses an item renderer with buttons and data. I need to add a checkbox and get the value of this checkbox passed along with the event of the pushbutton.
When the user clicks "add to menu: there is a click handler:
protected function addButton_clickHandler(event:MouseEvent):void
                    doubleIt = double.selected;
                    owner.dispatchEvent(new Event("ADD_TO_MENU", true));
Back in the main application, there is a listener for this event. I want that handler to be able to "know" the status of that checkbox (i.e. the value of "doubleIt", defined as a public boolean).
private function addToMenuHandler(event:Event):void {
           var i:int = event.target.selectedIndex;
           var obj:Object = new Object();
           obj = recipeListCollection.getItemAt(i);
           menuList += obj;
I have tried various permutations of the event.target, but can't figure out how to access that variable.

Create a custom event and stuff anything you want in there.
Alex Harui
Flex SDK Developer
Adobe Systems Inc.
Blog: http://blogs.adobe.com/aharui

FM for Actual cost line items for orders.

HI EXPERTS,
I was working on Actual cost line items for orders / Internal orders of an employee.
standard program RKAEP000 is present through TCODE KOB1.
I want some customization of report, so debugged the program and found that its using a FM 'K_LINE_ITEMS_SELECT_AND_LIST' to calculate internal orders.
But the FM has used REUSE_ALV_* and displaying output itself.
the requirement is to customize the output display .
I searched with K_LINE_* and found some other function modules too.
K_LINE_ITEM_CHECK
K_LINE_ITEM_APC_SIGN_GET
K_LINE_ITEM_GET_CONTEXT_MENU
K_LINE_ITEM_GET_TOOLBAR
K_LINE_ITEM_LOGICAL_KEY_GET
K_LINE_ITEM_TECH_SETTINGS_SET
K_LINE_ITEM_VALUE_TYPES_GET
K_LINE_ITEM_VALUE_TYPES_SET
K_LINE_ITEMS_ACT_GRID
K_LINE_ITEMS_SELECT
K_LINE_ITEMS_SELECT_AND_LIST
K_LINE_ITEM_ACT_CALL_WITH_DATA
K_LINE_ITEM_ACT_DATA_GET
K_LINE_ITEM_CM_CALL_WITH_DATA
K_LINE_ITEM_DEV_CALL_WITH_DATA
K_LINE_ITEM_PLN_CALL_WITH_DATA
K_LINE_ITEM_PROCESS_UCOMM_ACT
K_LINE_ITEM_STEERING_GET
Can anybody tell which FM should i use so that result i will get in an internal table?
or suggest any other methods
Thanks in Advance.
Lucky

I also had the same requirement and used function module K_LINE_ITEM_ACT_DATA_GET
this function is calling K_LINE_ITEMS_SELECT_AND_LIST function with I_NO_DISPLAY parameter
and returning the result.
Already they are in same function group,
I wrote this for future requirements of people after 4 years of this thread

Actual cost line items for orders (KOB1)

Hello everyone,
I need to pull a certain field for an order to the
Actual cost line items for orders report (KOB1), but the field is not available when I
go to the change layout. Can someone let me know how I can have this
field listed?
Thanks in advance for your reply.
Daniel Nicula

Hi Christian,
Ok, so I would need some ABAP support for this right? I was hoping to do it myself.
But, the strange thing is that the field that I would like to bring in my layout is available in 2 clients in the same system and not in all the clients. I have one client in which this field is not available.
How can that be possible?
Bye!

750 to 1200 line items per order

Hi
Does any body have the experience of creating order with 750-1200 line items per order, in such scenario how the performance of the e-commerce was handled, was any custom development made to achieve.
please let us know
thanks
vignesh

Stefan, as stated, this was not well thought through solution (but with some work would be possible to achieve).
Regarding memory leaks. We have spent quite a bit of time looking in-depth at the shop code over the years and have so far seen very little evidence of actual memory leaks.
MASSIVE memory consumption, yes, definitely, but no actual leaks
If you have a suitable OS and JVM running that will allow you to crank up your JVM memory settings then you will most likely see that the memory usage will plateau...it might just be at a much higher level than you would have reasonably expected.
To give you an example. One of our customers was running a very large catalog (900 000 items) and the shop used 22 GB of memory when running. One of the main reasons in their case, with such a big catalog, was how the web shop chooses to create web cat items and cache them. Deep in the standard shop code you can find that there are lots and lots of ArrayLists initiated and they are all given a >0 default length, which consumes memory even when empty. In this particular case this became such a big issue that we sent SAP the proof that if they would initiate the ArrayLists with 0 length the memory consumption would drop significantly for each WebCatItem instance.
We estimated at the time after some in-place replacements of the CatalogAttributeValue, class out of the pcatAPI.jar where we set it by default to null instead of size of 10 that we would have saved about 40% of memory consumption. We even prepared the test case and sent it all to SAP, but don't think we ever got it implemented in standard code.
Another suggestion was that SAP would implement a LRU cache for catalog caching for larger catalogs....again would help with memory usage challenges.
With another customer we had 1 Million+ hits per business day (8 h period) and I can't remember us ever having to chase up memory leaks in the standard shop code...they might exist, but perhaps the usage scenarios I've been involved in have just not brought most of them to daylight.
Purely out of interest...if you have found memory leaks in the shop it would be interesting to hear where you found them.
Cheers
Kalle

Not displaying Actual cost Line Items for Order

Hi Gurus,
Recently we did patching from SPC6 to SPC8. After patching we noticed that could not able to see displaying Actual cost Line Items for Order from work order.
System is not throughing error message when I double cline on line item at Plan/Actual Comparison screen in work order cost tab.
We can able to see the same from KB01 with out any problem. I have attached the details.
Could any one suggest me please. Appreciate your thoughts
Regards,
Srini

Hi Paul,
I have implemented this note and get it sorted out.
Thank you for support.
Regards,
Srini

Datagrid Item Renderer not displaying correct data

I have a datagrid that displays information from a web service, which is refreshed every 60 seconds.
When the status is no 0 for a line a corresponding color is used to fill in the background. I created a Item Renderer to fill in the background color.
When the table is initially created, the colors are correct. After the data is refreshed, then the background color value is carried over to the next row.
The Spark DataGrid works better than the MX AdvancedDateGrid or DataGrid. This was working in Flex 3, but I used an function which replaced the DataGridColumn that doesn't work in Flex 4.
protected function init(event:FlexEvent):void
                var showBackground:Boolean = false;
                var backgroundColor:uint = new uint();
                var labelTextColor:uint = new uint();
                var dgListData:DataGridListData = listData as DataGridListData;
                var dataGrid:DataGrid = dgListData.owner as DataGrid;
                // comment this out if you want to see the background over the
                // selection and highlight indicators
                if (dataGrid.isItemSelected(data) || dataGrid.isItemHighlighted(data))
                    // clear the background so you can see the selection/highlight colors
                    showBackground = false;
                    return;
                switch(data["MessageLevel"])
                    case 0:
                        showBackground = false;
                        backgroundColor = 0xFFFFFF;
                        labelTextColor = 0x000000;
                        break;
                    case 1:
                        showBackground = true;
                        backgroundColor = 0x00FF00; // light green
                        labelTextColor = 0x000000;
                        break;
                    case 2:
                        showBackground = true;
                        backgroundColor = 0x015F00; // dark green
                        labelTextColor = 0xFFFFFF;
                        break;
                    case 3:
                        showBackground = true;
                        backgroundColor = 0xFDFF00; // yellow
                        labelTextColor = 0x000000;
                        break;
                    case 4:
                        showBackground = true;
                        backgroundColor = 0x7F6E3F; // tan
                        labelTextColor = 0xFFFFFF;
                        break;
                    case 5:
                        showBackground = true;
                        backgroundColor = 0xFF8A00; // orange;
                        labelTextColor = 0x000000;
                        break;
                    case 6:
                        showBackground = true;
                        backgroundColor = 0xFFDFE0; // rose
                        labelTextColor = 0x000000;
                        break;
                    case 7:
                        showBackground = true;
                        backgroundColor = 0xFF0000; //red
                        labelTextColor = 0xFFFFFF;
                        break;
                if(showBackground) {
                    var bgFill:SolidColor = new SolidColor();
                    bgFill.color = backgroundColor;
                    dataContainer.setStyle("backgroundColor",backgroundColor);
                    lblData.setStyle("color", labelTextColor);

I added an "else" statement to make sure that a color was always added, even if the level was 0. I also added a backgroundAlpha style to both, to turn the value off or on.
So far, this seems to be the solution.
if(showBackground) {
var bgFill:SolidColor = new SolidColor();
bgFill.color = backgroundColor;
dataContainer.setStyle("backgroundColor",backgroundColor);
labelDisplay.setStyle("color", labelTextColor);
dataContainer.setStyle("backgroundAlpha",1);
} else {
dataContainer.setStyle("backgroundColor",backgroundColor);
labelDisplay.setStyle("color", labelTextColor);
dataContainer.setStyle("backgroundAlpha",0);

Item rendering order

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