ReferenceError: Error #1056: Cannot create property handler

After updating my lcds application to LCSD 4.6 I get many of these errors. In debug log I can see, that java sends this handler property for some objects, e.g.
(com.mm_katalogy.model.MutaceStrankyDTO_$$_javassist_40){id=4} (1675022032) {
            id = 4
            nazev_stranky = 4
            seznam_oddeleni = [] (class: org.hibernate.collection.PersistentSet)
            fk_katalog_verze = 1
            handler = [email protected]4da
But in my actionscript DTO objects there is no such property. How could I fix this?

If you are referring to the latest Flex Hero as the 4.5.0.19786 build, that was posted on Thu Feb 3, 2011, then that is the build that I am having issues with.
I am not sure what you mean by, "... and use the binaries from there...". What binaries are you referring to? And when I have these binaries where would I use them? As I mentioned in my second post of this thread, I used the 19786 build in FlashBuilder and it doesn't even attempt to compile on application. Evidently its missing compilers.
At any rate, now I am using the build that is listed before 19786 with no issues. I replaced the textLayout SWC with the latest one on sourceforge.

Similar Messages

Arrgh! this is killing me! ReferenceError: Error #1056: Cannot create property x_MC on document cla

Oh man! jsut when i thought I w'as getting somewhere! I thought I had my load and unload code sorted and now I am getting this error for a particular .swf that I am trying to load. the loader code is working fine, it will load a test. The particular.swf works fine on its own, but it wont load for some reason! Argh!!!!! AM I just a total $%#^%# idiot or waht! This process has been like having my eyeballs extracted by ants!
Please please help
ReferenceError: Error #1056: Cannot create property write_visionMC on aavar.
          at flash.display::Sprite/constructChildren()
          at flash.display::Sprite()
          at flash.display::MovieClip()
          at aavar()
write_visionMC is the a movieclip inside the .swf I am trying to load    aavar() is my docuemnt class

use the trace() function to debug. start by confirming that your document class'es constructor is being called. then use traces to make sure your movieclip exists before it's being referenced.

Need urgetn help: ReferenceError: Error #1056: Cannot create property btnEnterJ on mmquizzingv4_as3.

I created random quiz with 20 questions and tested it at www.scorm.com for scorm compliance testing. When I launch the course, i get the below error message. If I select continue and proceed to the quiz, after answering few question, randomly submit button for one of the questions is getting disabled. Please help.
ERROR MESSAGE:
ReferenceError: Error #1056: Cannot create property btnEnterJ on mmquizzingv4_as3.mmquizclasses.SubmitButton.
    at flash.display::Sprite/constructChildren()
    at flash.display::Sprite()
    at flash.display::MovieClip()
    at captivate.veela_as3::rdBase()
    at captivate.veela_as3::rdItem()
    at mmquizzingv4_as3.mmquizclasses::QuestionButton()
    at mmquizzingv4_as3.mmquizclasses::SubmitButton()
    at flash.display::Sprite/constructChildren()
    at flash.display::Sprite()
    at flash.display::MovieClip()
    at mmquizzingv4_as3.mmquizclasses::Question()
    at flash.display::Sprite/constructChildren()
    at flash.display::Sprite()
    at flash.display::MovieClip()
    at captivate.veela_as3::rdBase()
    at captivate.veela_as3::rdSlide()
    at captivate.veela_as3::rdQPSlide()

I got the code when I up graded to Adobe air and it has a conflect with accure weather..... Looks like someone attached it to the upgrade to Adobe 8
Enter the code in the Adobe support search web page and you get another erro code not in English....hummmm   Google comes up on the support button
to reg the google internet browers I did and google came up and I type in the adobe 1056 error...Over 5 third party free fixes came up???? Windows 7
didn't like anyone of them.......I called Adobe support and no help for free......I uninstalled the Adobe Air and the error went away along with adobe Air...
It seems everyone else knows there is a problem but Adobe???? I love Adobe.....I don't like there lack of Training their customer support people....

ReferenceError: Error #1056: Cannot create property

Hello,
I have been playing around with passing objects between Flex and BlazeDS.
I have a Java VO:
package vo;
import java.util.Date;
import java.util.Set;
public class TestVO
private long aInt;
private double aDouble;
private boolean aBool;
private Date aDate;
private String aString;
private Set aSet;
public void setAInt(long aInt)
this.aInt = aInt;
public long getAInt()
return aInt;
public void setADouble(double aDouble)
this.aDouble = aDouble;
public double getADouble()
return aDouble;
public void setABool(boolean aBool)
this.aBool = aBool;
public boolean isABool()
return aBool;
public void setADate(Date aDate)
this.aDate = aDate;
public Date getADate()
return aDate;
public void setAString(String aString)
this.aString = aString;
public String getAString()
return aString;
public void setASet(Set aSet)
this.aSet = aSet;
public Set getASet()
return aSet;
and the corresponding ActionScript VO:
package vo
import mx.collections.ArrayCollection;
[Bindable]
[RemoteClass(alias="vo.TestVO")]
public class TestVO
public var aInt : int;
public var aDouble : Number;
public var aBool : Boolean;
public var aDate: Date;
public var aString : String ;
public var aSet : ArrayCollection = new ArrayCollection();
When passing an instantiated object back from java I get these errors in the console:
ReferenceError: Error #1056: Cannot create property AString on vo.TestVO.
ReferenceError: Error #1056: Cannot create property AInt on vo.TestVO.
ReferenceError: Error #1056: Cannot create property ASet on vo.TestVO.
ReferenceError: Error #1056: Cannot create property ADouble on vo.TestVO.
ReferenceError: Error #1056: Cannot create property ABool on vo.TestVO.
ReferenceError: Error #1056: Cannot create property ADate on vo.TestVO.
If I change my ActionScript VO to the following it works:
package vo
import mx.collections.ArrayCollection;
[Bindable]
[RemoteClass(alias="vo.TestVO")]
public class TestVO
public var AInt : int;
public var ADouble : Number;
public var ABool : Boolean;
public var ADate: Date;
public var AString : String ;
public var ASet : ArrayCollection = new ArrayCollection();
I dont particulary want to use this naming convention for my variables. Making the Java variables public also works but I dont want to do this either?
Is there anything I can do or is this the way it is?
Cheers

Hey try this in your actionscript code
package vo
import mx.collections.ArrayCollection;
[Bindable]
[RemoteClass(alias="vo.TestVO")]
public class TestVO
private var _aInt:int;
private var _aDouble:Number;
private var _aBool:Boolean;
private var _aDate:Date;
private var _aString:String;
private var _aSet:ArrayCollection = new ArrayCollection();
public function get aInt():int{return _aInt;}
public function set aInt(aInt:int):void
this._aInt = aInt;
public function get aDouble():Number{
return _aDouble;
public function set aDouble(aDouble:Number):void{
this._aDouble = aDouble;
public function get aDate():Date{return this._aDate;}
public function set aDate(aDate:Date):void{
this._aDate = aDate;
public function get aString():String{return this._aString;}
public function set aString(aString:String):void{
this._aString = aString;
public function get aSet():ArrayCollection{return this._aSet;}
public function set aSet(aSet:ArrayCollection):void{
this._aSet = aSet;
---That should work cos I had the same problem today and that was how I solved it.
--Patrick

ReferenceError: Error #1056: Cannot create property 0 on Number.

Hi, I have an AS3 script that calls an XML but when compiling I get this error
ReferenceError: Error #1056: Cannot create property 0 on Number.
at mod::ML/parseData()
at mng::DM/onXMLLoaded()
Here are some snippets
the first script that defines the XML
 private function addedToStageHandler(event:Event = null) : void
 var _loc_2:* = Application.getInstance();
 Application.xmlPath = "xml/soc.xml";
 _loc_2.initialize(this);
 return;
here is the ML one
 public class Model extends EventDispatcher implements IModel
 public var social:Social;
 public function Model()
 return;
 public function parseSocialData(param1:XML) : void
 this.social = new Social(param1);
 this.socialSection.social = this.social;
 return;
 public function getSectionData(param1:String) : Absec
 var _loc_2:Absec = null;
 switch(param1)
 case "SocialSection":
 _loc_2 = this.socialSection;
 break;
 return _loc_2;
 public function parseData(param1:XML) : void
 this.socialSection = new SocialSection(XML(_loc_3));
 var _loc_4:int = 0;
 var _loc_5:* = xml.sections.section;
 var _loc_3:* = new XMLList("");
 for each (_loc_6 in _loc_5)
 var _loc_7:* = _loc_5[_loc_4];
 with (_loc_5[_loc_4])
 if (@id == "SocialSection")
 _loc_3[_loc_4] = _loc_6;
here is the DM one
 private function onXMLLoaded(event:Event) : void
 var _loc_2:* = new XML(event.target.data);
 this.model.parseData(_loc_2);
 dispatchEvent(new Event(XML_LOADED));
 return;
and the XML
<section id="SocialSection" active="true" visible="true" default="false">
 <name><![CDATA[SOCIAL]]></name>
 <title><![CDATA[SOCIAL]]></title>
 <forums>
 <line1><![CDATA[POST ON THE]]></line1>
 <line2><![CDATA[FORUMS]]></line2>
 <rollover><![CDATA[Have questions? Click here.]]></rollover>
 <url>link_to_forum</url>
 </forums>
</section>
I think the issue is _loc_4 but not sure how to fix this. Thanks!

Hi, thanks for your reply. I did as you suggested and the error is here for ML
 _loc_3[_loc_4] = _loc_6;
and here for DM
 this.model.parseData(_loc_2);
And it's more cryptic than before : ). I think the DM error is predictable because of the first one
The complete error list is
ReferenceError: Error #1056: Cannot create property 0 on Number.
at mod::ML/parseData()
at mng::DM/onXMLLoaded()
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at flash.net::URLLoader/onComplete()
again, I think everything starts with ML script error
Thanks!

ReferenceError: Error #1056: Cannot create property...IEditManager::delayedOperations

When I compile a somewhat complex application, I immediately get the following error:
ReferenceError: Error #1056: Cannot create property flashx.textLayout.edit:IEditManager::delayedOperations on flashx.textLayout.edit.EditManager.
But when I compile one of the TLF’s sample projects, I do not receive this error.
I am using the following:
Flex SDK: 4.5.0.17689 (build date: Oct 24, 2010)
TLF: build 232
I came across this post back in November 17, 2010 and as rdermer mentioned, this issue got addressed in build 204. This change is also documented in the TLF’s ReleaseNotes.txt file. But I am not sure why it’s happening again. I am using the latest available builds without building the SDK and TLF locally?

If you are referring to the latest Flex Hero as the 4.5.0.19786 build, that was posted on Thu Feb 3, 2011, then that is the build that I am having issues with.
I am not sure what you mean by, "... and use the binaries from there...". What binaries are you referring to? And when I have these binaries where would I use them? As I mentioned in my second post of this thread, I used the 19786 build in FlashBuilder and it doesn't even attempt to compile on application. Evidently its missing compilers.
At any rate, now I am using the build that is listed before 19786 with no issues. I replaced the textLayout SWC with the latest one on sourceforge.

Error #1056: Cannot create property __id0_ on ModuleSwf

I have a document class for a SWF. This SWF compiles and runs fine. When I load it inside another SWF, I get this:
ReferenceError: Error #1056: Cannot create property __id0_ on ModuleSwf.
          at flash.display::Sprite/constructChildren()
          at flash.display::Sprite()
          at flash.display::MovieClip()
          at ModuleSwf()
ModuleSwf is the document class of the loaded SWF. What is causing this?

ReferenceError: Error #1056: Cannot create property __id0_ on ModuleSwf.
          at flash.display::Sprite/constructChildren()
          at flash.display::Sprite()
          at flash.display::MovieClip()
          at ModuleSwf()[C:\Users\me\Projects\MyProject\Production\Assembly\classes\ModuleSwf.as:17]
package
          import flash.display.DisplayObject;
          import flash.display.MovieClip;
          import flash.events.Event;
          public class ModuleSwf extends MovieClip
          {   // This is line 17
            public function ModuleSwf()
                              if (this != root)
                                        stop();
                              addEventListener(Event.ADDED_TO_STAGE, addedToStageHandler, false, 0, true);
                              addEventListener(Event.REMOVED_FROM_STAGE, removedFromStageHandler, false, 0, true);

Error #1056: Cannot create property text on String.

Ok, i fixed the last error message, but i still cant get the xml to load, I am getting this error message now
What does this mean, I can't seem to figure it out.
I am trying to load the title of a video reel onto a button
and load a corresponding move, 1 of 4...getting this error now
ReferenceError: Error #1056: Cannot create property text on String.
 at main2_fla::MainTimeline/setVids()
 at main2_fla::MainTimeline/xmlLoaded()
 at flash.events::EventDispatcher/dispatchEventFunction()
 at flash.events::EventDispatcher/dispatchEvent()
 at flash.net::URLLoader/onComplete()
this is the correspoding codeits referring to:
function setVids():void {
 for(var i = 0; i < 3; i++) {
 var name_txt:String = vidList_XML.vid[i + count].file;
 var reelTitle = this["vid" + (i + 1)].name;
 reelTitle.text = name_txt;

It is telling you that you can't create a property called "text" on an instance of the String class.
var reelTitle = this["vid" + (i + 1)].name;
That is assigning the name property of this["vid"+(i+1)] to the variable reelTitle. You haven't typed the variable, but "name" properties are always Strings, so reelTitle is a String.
And the String class is not dynamic, so you can't just go adding properties to it.
My guess is that you want something like this:
var reelTitle:TextField=this.getInstanceByName("vid"+(i+1))
reelTitle.text=name_txt
Or something like that....

Error #1056: Cannot create property metaClass

Hello,
I've been working on integrating an app between Grails, Flex and BlazeDS. Unfortunately, I keep running into an ' ReferenceError: Error #1056: Cannot create property metaClass' error. Googling hasn't really yielded much of a result and I'm not sure what to do at this point. Could anyone help?
Thanks in advance.

Any ideas so far anyone?

Error #1056: Cannot create property allowCodeImport on flash.system.LoaderContext.

Runs good at browser but running directly on flash player causes this error.Error #1056: Cannot create property allowCodeImport on flash.system.LoaderContext.

Isn't this a question for the Flash Player forum?
http://forums.adobe.com/community/flashplayer

Setting executeInBackground = true on iOS Cannot create property error

I'm using Flash Builder 4.7, created a Flex Mobile project.
When my application deactivates, it needs to send a single POSt HTTP request to my server. It takes a few milliseconds to send, and on Android it works just fine. However, on iOS, since the app is suspended, the request is not sent until I activate the app again.
I've looked online and tried this solution:
adding the line
    NativeApplication.nativeApplication.executeInBackground = true;
In the home view, or just before sending the request, raises an exception:
ReferenceError: Error #1056: Cannot create property executeInBackground on flash.desktop.NativeApplication.
          at views::BnpSampleHomeView$cinit()
          at global$init()
          at BnpSample()[C:\eclipse\projects\BnpSample\src\BnpSample.mxml:3]
          at _BnpSample_mx_managers_SystemManager/create()[_BnpSample_mx_managers_SystemManager.as:51]
          at mx.managers.systemClasses::ChildManager/initializeTopLevelWindow()[E:\dev\4.y\frameworks\ projects\framework\src\mx\managers\systemClasses\ChildManager.as:311]
          at mx.managers::SystemManager/initializeTopLevelWindow()[E:\dev\4.y\frameworks\projects\fram ework\src\mx\managers\SystemManager.as:3057]
          at mx.managers::SystemManager/http://www.adobe.com/2006/flex/mx/internal::kickOff()[E:\dev\4.y\frameworks\projects\framework\src\mx\managers\SystemManager.as:2843]
          at mx.managers::SystemManager/http://www.adobe.com/2006/flex/mx/internal::preloader_completeHandler()[E:\dev\4.y\frameworks\projects\framework\src\mx\managers\SystemManager.as:2723]
          at flash.events::EventDispatcher/dispatchEventFunction()
          at flash.events::EventDispatcher/dispatchEvent()
          at mx.preloaders::Preloader/timerHandler()[E:\dev\4.y\frameworks\projects\framework\src\mx\p reloaders\Preloader.as:542]
          at flash.utils::Timer/_timerDispatch()
          at flash.utils::Timer/tick()
Help is apprecaited

Some parts of this topic may be of help:
http://forums.adobe.com/message/4359474

ReferenceError: Error #1056:

Getting this error when instantiating this class. It's set up
in my FLA as the document class:
ReferenceError: Error #1056: Cannot create property tab0 on
classes.tagwidget.TagWidget.
at classes.tagwidget::TagWidget/::addTabs()
at classes.tagwidget::TagWidget$iinit()

Hey,
After declaring my custom class that extends MovieClip as dynamic, it worked! But then all the AS3 code I placed in the frames of the Movieclip don't run now... would u happen to know why?

ReferenceError: Error #1056 - Has anyone come across this error?

ReferenceError: Error #1056: Cannot create property text on spark.components.DataGroup.
 at mx.binding::Binding/defaultDestFunc()[E:\dev\trunk\frameworks\projects\framework\src\mx\b inding\Binding.as:270]
 at Function/http://adobe.com/AS3/2006/builtin::call()
 at mx.binding::Binding/innerExecute()[E:\dev\trunk\frameworks\projects\framework\src\mx\bind ing\Binding.as:473]
 at Function/http://adobe.com/AS3/2006/builtin::apply()
 at mx.binding::Binding/wrapFunctionCall()[E:\dev\trunk\frameworks\projects\framework\src\mx\ binding\Binding.as:385]
 at mx.binding::Binding/execute()[E:\dev\trunk\frameworks\projects\framework\src\mx\binding\B inding.as:321]
 at mx.binding::Binding/watcherFired()[E:\dev\trunk\frameworks\projects\framework\src\mx\bind ing\Binding.as:499]
 at mx.binding::Watcher/notifyListeners()[E:\dev\trunk\frameworks\projects\framework\src\mx\b inding\Watcher.as:311]
 at mx.binding::PropertyWatcher/eventHandler()[E:\dev\trunk\frameworks\projects\framework\src \mx\binding\PropertyWatcher.as:377]
 at flash.events::EventDispatcher/dispatchEventFunction()
 at flash.events::EventDispatcher/dispatchEvent()
 at mx.core::UIComponent/dispatchEvent()[E:\dev\trunk\frameworks\projects\framework\src\mx\co re\UIComponent.as:12140]
 at spark.components::DataRenderer/set data()[E:\dev\trunk\frameworks\projects\spark\src\spark\components\DataRenderer.as:122]
 at spark.components::DataGroup/updateRenderer()[E:\dev\trunk\frameworks\projects\spark\src\s park\components\DataGroup.as:819]
 at spark.components::DataGroup/setUpItemRenderer()[E:\dev\trunk\frameworks\projects\spark\sr c\spark\components\DataGroup.as:793]
 at spark.components::DataGroup/http://www.adobe.com/2006/flex/mx/internal::itemAdded()[E:\dev\trunk\frameworks\projects\s park\src\spark\components\DataGroup.as:1316]
 at spark.components::DataGroup/initializeDataProvider()[E:\dev\trunk\frameworks\projects\spa rk\src\spark\components\DataGroup.as:609]
 at spark.components::DataGroup/commitProperties()[E:\dev\trunk\frameworks\projects\spark\src \spark\components\DataGroup.as:722]
 at mx.core::UIComponent/validateProperties()[E:\dev\trunk\frameworks\projects\framework\src\ mx\core\UIComponent.as:7684]
 at mx.managers::LayoutManager/validateProperties()[E:\dev\trunk\frameworks\projects\framewor k\src\mx\managers\LayoutManager.as:572]
 at mx.managers::LayoutManager/doPhasedInstantiation()[E:\dev\trunk\frameworks\projects\frame work\src\mx\managers\LayoutManager.as:730]
 at mx.managers::LayoutManager/doPhasedInstantiationCallback()[E:\dev\trunk\frameworks\projec ts\framework\src\mx\managers\LayoutManager.as:1069]
This error is generated by the following code in the item renderer:
 <s:Label id="owner"
 text="{(data.member as MemberVO).name}"
 />
I’ve examines the data provider array collection and from what I can tell, all is as expected!
I'm using Flex 4, nightly build 11921 in Windows XP environment

Shankar,
Thanks for the hint but I just discovered that it was the id that I assigned to the Label in s:ItemRenderer that was causing this error. I changed id value from 'owner' to 'owner1' and that took care of that error. If 'owner' is an existing property in the class hierarchy of s:ItemRenderer, shouldn't it give some "Identifier used more than once" type of error?
In any case, I'm closing this case and hopefully someone familiar with this fundamentals of this issue will throw some light on it.

LMS 3.2 - Backup-Error -- ERROR(908): Cannot create or back up tar file

Hello again,
with performing backup (LMS 3.2 on Solaris 9) the following errors will arise.
dbbackup.log
/opt/CSCOpx/bin/tar: Removing leading `/' from absolute path names in the archive Apps file : /opt/CSCOpx/backup/manifest/upm/upminfo/datafiles.txt
[Tue Dec 8 08:56:54 2009] Archiving the contents of the following directories into /enbw/backup/files/cw_db_backup/0/upm/filebackup.tar
[Tue Dec 8 08:56:54 2009] /opt/CSCOpx/hum/conf/upm-snmp.properties
/opt/CSCOpx/hum/thresholdscript /opt/CSCOpx/MDC/tomcat/webapps/upm/reports
/opt/CSCOpx/MDC/tomcat/webapps/upm/WEB-INF/classes/com/cisco/nm/upm/properti
es/common/UPM.properties
/opt/CSCOpx/bin/tar: Removing leading `/' from absolute path names in the archive
/opt/CSCOpx/bin/tar: Cannot add file
/opt/CSCOpx/MDC/tomcat/webapps/upm/reports/virt32841308_657_658_-718594975:
No such file or directory
/opt/CSCOpx/bin/tar: Cannot add file
/opt/CSCOpx/MDC/tomcat/webapps/upm/reports/virt32841308_658_659_1465769167:
No such file or directory
/opt/CSCOpx/bin/tar: Error exit delayed from previous errors [Tue Dec 8 09:07:30 2009] ERROR(908): Cannot create or back up tar file. Backup cancelled. Verify that you have write-access to this directory. [Tue Dec 8 09:07:30 2009] Backup failed: 2009/12/08 09:07:40 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Is seems to be problem related to maximal filesize handling of GNUtar implemented in CW2000.
The problem is with tar'ing HUM-Reports in /opt/CSCOpx/MDC/tomcat/webapps/upm/reports, and with reaching
tarfile-size of 2,9GByte error is thrown.
</exxx/backup/files/cw_db_backup/0/upm># ls -lh
total 6126448
-rw-r----- 1 casuser casusers 2.9G Dec 8 09:07 filebackup.tar
</exxx/backup/files/cw_db_backup/0/upm># ls -al
total 6126452
drwxr-x--- 2 casuser casusers 512 Dec 7 14:30 .
drwxr-x--- 11 casuser casusers 512 Dec 7 14:30 ..
-rw-r----- 1 casuser casusers 3135201280 Dec 8 09:07 filebackup.tar
GNUtar-Version
# /opt/CSCOpx/bin/tar --version
tar (GNU tar) 1.13
Copyright (C) 1988, 92,93,94,95,96,97,98, 1999 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Written by John Gilmore and Jay Fenlason.
Is this a know problem?
Thanks for any thoughts.
Best Regards
Lothar

Hi Joe,
thanks for your feedback.
These files to be tarred aren't there directly after backup stops with error.
It seems that some process stores data about reports in that file and when trying to
pack these reports via tar they are delete by any cleanup method.
Does this help.
P.S. Backup usually takes about more than 1hour

Cannot create property defaultColumnCount on mx.controls.DataGrid

The app compiles fine but an error occurs at runtime.
Code:
<mx:DataGrid width="100%"
 height="100%"
 lockedColumnCount="6"
 horizontalScrollPolicy="on"
 defaultColumnCount="1">
Error:
Cannot create property defaultColumnCount on mx.controls.DataGrid
Property description:
http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/mx/controls/listClasses /ListBase.html#defaultColumnCount

it appears that datagrid does not inherite that property from listbase class or if it does its encapsulated so that is only used withing the class.
what are you trying to do. when i look a the source code for flex datagrid i saw this.
private var _columns:Array; // the array of our DataGridColumns
 [Bindable("columnsChanged")]
 [Inspectable(category="General", arrayType="mx.controls.dataGridClasses.DataGridColumn")]
 * An array of DataGridColumn objects, one for each column that
 * can be displayed. If not explicitly set, the DataGrid control
 * attempts to examine the first data provider item to determine the
 * set of properties and display those properties in alphabetic
 * order.
 * If you want to change the set of columns, you must get this array,
 * make modifications to the columns and order of columns in the array,
 * and then assign the new array to the columns property. This is because
 * the DataGrid control returned a new copy of the array of columns and therefore
 * did not notice the changes.
 * @langversion 3.0
 * @playerversion Flash 9
 * @playerversion AIR 1.1
 * @productversion Flex 3
 override public function get columns():Array
 return _columns.slice(0);
 * @private
 override public function set columns(value:Array):void
 var n:int;
 var i:int;
 n = _columns.length;
 for (i = 0; i < n; i++)
 columnRendererChanged(_columns[i]);
 freeItemRenderersTable = new Dictionary(false);
 columnMap = {};
 _columns = value.slice(0);
 columnsInvalid = true;
 generatedColumns = false;
 n = value.length;
 for (i = 0; i < n; i++)
 var column:DataGridColumn = _columns[i];
 column.owner = this;
 column.colNum = i;
 if (column.cachedHeaderRenderer)
 var item:DisplayObject = column.cachedHeaderRenderer as DisplayObject
 if (item.parent)
 item.parent.removeChild(item);
 column.cachedHeaderRenderer = null;
 updateSortIndexAndDirection();
 fontContextChanged = true;
 invalidateProperties();
 itemsSizeChanged = true;
 invalidateDisplayList();
 dispatchEvent(new Event("columnsChanged"));
its ovbious to me that flex is calculating how many columns will appear on the datagrid depending on the dataprovider you supply.
Or if you would like to only show a specific amount of columns you can futher define them in your grid like so
<mx:DataGrid id="grid" columnCount="2">
<mx:columns>
<mx:DataGridColumn headerText="column1"/>
<mx:DataGridColumn headerText="column2"/>
</mx:columns>
</mx:DataGrid >

ReferenceError: Error #1056: Cannot create property handler

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