Hello SOers, I've run into a nice problem with the UIComponent.addChild(...) function.

First of all, I'm using ESRI Api for Flex. In this API you find a class called Graphic that inherits UIComponent. Basically, I'm trying to add, as a child, a Graphic 'g' to another graphic 'parent'. So that when you delete the 'parent' graphic the 'g' graphic deletes as well.

private function writeMeasurements(parent:Graphic):void
{
 var g:Graphic;
 if(parent.geometry.extent != null)
  g = new Graphic(parent.geometry.extent.center);
 else
  g = new Graphic(parent.geometry);
 g.initialize();

 g.name = UIDUtil.createUID();
 g.symbol = txtSym;

 graphicsLayer.add(g); 
 parent.addChild(g);
}

graphicsLayer class

This code actually runs pretty fine. The problem is after... it's like if the addChild function was asynchronious.

This is the error I get :

TypeError: Error #1009: Il est impossible d'accéder à la propriété ou à la méthode d'une référence d'objet nul.
 at com.esri.ags::Graphic/updateDisplayList()[C:\checkout\flex_api\api\src\com\esri\ags\Graphic.as:346]
 at mx.core::UIComponent/validateDisplayList()
 at mx.managers::LayoutManager/validateDisplayList()
 at mx.managers::LayoutManager/doPhasedInstantiation()
 at Function/http://adobe.com/AS3/2006/builtin::apply()
 at mx.core::UIComponent/callLaterDispatcher2()
 at mx.core::UIComponent/callLaterDispatcher()

I know this is a very specific question, but I think you guys are the BEST!

Thanks.