Databinding issue

Question

Hi,
when I explicitely use databing in my development, I often encounter the following issue :
I link an ArrayCollection with a view component, in order to provide the data to display, using the {} syntax in the skin mxml class.
In the .as skinnable component class, I define a getter/setter bindable methods which store data, set a changing flag to false and call the invalidateDisplayList() method. In the updateDisplayList() method, I iterate through the ArrayCollection and I add visual items to the component display list.
protected var _data:ArrayCollection;
protected var _dataChanged:Boolean;
[Bindable]
public function get data():ArrayCollection
   return _data;
public function set data( p_value:ArrayCollection ):void
   _data = p_value;
   _dataChanged = true;
   invalidateDisplayList();
override protected function updateDisplayList( p_unscaledWidth:Number, p_unscaledHeight:Number ):void
   super.updateDisplayList( p_unscaledWidth, p_unscaledHeight );
   if( _dataChanged )
      // create and add items
This mechanism works fine.
But if I modify the original ArrayCollection using addItem() or removeItem() methods, which is supposed to be binded with the component, the setter is not called and nothing happens.
I have to explicitely call the setter method and re-create an ArrayCollection for the component to update the display list.
Is it the regular mechanism or do I miss something?
Thanks.
Vincent.

Answer 1

Flex harUI is correct,you can solve your problem by using ObjectProxy class.Below is the link how to use objectproxy.
http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/mx/utils/ObjectProxy.ht ml