Tree view does not update when you add the first node to node expanded

Hello

Please take a look in the following code. To reproduce the incorrect behavior, you must expand the item, then click on the button 'Add' and observe, that nothing is happening. Collapse, then developing the watch node children added. I use Flex 3.5.0

Is this a bug in the SDK, or am I missing a switch of AutoUpdate?

Thank you!!

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="horizontal" 
     minWidth="955" minHeight="600"
     creationComplete="run()">
     
     <mx:Tree id="tree" width="300" height="500" labelField="name" />
     
     <mx:Button label="add" click="onClickAdd()" />
     
     <mx:Script>
          <![CDATA[
               import mx.collections.ArrayCollection;
               import mx.utils.ObjectProxy;
               
               protected var itm1:Object;
               
               
               protected function run() : void
               {
                    var ac:ArrayCollection = new ArrayCollection();
                    
                    this.itm1 = new ObjectProxy({name:"1", children:new ArrayCollection()});
                    ac.addItem(this.itm1);
                    this.tree.dataProvider = ac;
               }
               
               
               protected function onClickAdd() : void
               {
                    this.itm1.children.addItem({name:"child"});
               }
          ]]>
     </mx:Script>
     
</mx:Application>
 

I think that your case is equivalent to "loading lazy trees."  There are examples

around the internet.  I think you need to use a custom ITreeDataDescriptor

which returns true for hasChildren.

Tags: Flex

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