Flex tree

Maybe this can serve as a starting point:

<?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.XMLListCollection;
                  import mx.collections.ICollectionView;
                  private var dataXML:XML =
                        <root label="Root">
                  <node label="One" >
                     <node label="One" />
                    <node label="Two" />
                    <node label="Three">
                        <node label="One" />
                        <node label="Two" />
                    </node>
                    <node label="Four" />
                  </node>
                  <node label="Two" >
                     <node label="One" />
                    <node label="Two" />
                    <node label="Three">
                        <node label="One" />
                        <node label="Two" >
                            <node label="One" />
                                      <node label="Two" />
                                      <node label="Three">
                                          <node label="One" />
                                          <node label="Two" />
                                      </node>
                                      <node label="Four" />
                        </node>
                    </node>
                    <node label="Four" />
                  </node>
                  <node label="Three" />
                  <node label="Four">
                      <node label="One" />
                      <node label="Two" />
                      <node label="Three">
                          <node label="One" />
                          <node label="Two" />
                      </node>
                      <node label="Four" />
                  </node>
                  <node label="Five" />
                  <node label="Six" />
              </root>;

                  private function myFilter(node:Object):ICollectionView
                  {
                        return new XMLListCollection(node.node.(@label.substr(0,txt.text.length) == txt.text));
                  }
            ]]>
      </mx:Script>
      
      <mx:Tree id="tree" x="42" y="34" width="639" height="515" dataProvider="{dataXML}" labelField="@label" dataDescriptor="{new FilterDescriptor(myFilter)}"/>
      <mx:TextInput x="42" y="557" id="txt" change="tree.invalidateList();"/>
      
</mx:Application>

// Create as FilterDescriptor.as 
package
{
	import mx.collections.ICollectionView;
	import mx.controls.treeClasses.ITreeDataDescriptor; 
	public class FilterDescriptor implements ITreeDataDescriptor
	{
		private var _filter:Function;
		
		public function FilterDescriptor(filterFunction:Function)
		{
			_filter = filterFunction;
		} 
		public function getChildren(node:Object, model:Object=null):ICollectionView
		{
			return _filter(node);
		}
		
		public function hasChildren(node:Object, model:Object=null):Boolean
		{
			return getChildren(node, model).length > 0;
		}
		
		public function isBranch(node:Object, model:Object=null):Boolean
		{
			return hasChildren(node, model);
		}
		
		public function getData(node:Object, model:Object=null):Object
		{
			return null;
		}
		
		public function addChildAt(parent:Object, newChild:Object, index:int, model:Object=null):Boolean
		{
			return false;
		}
		
		public function removeChildAt(parent:Object, child:Object, index:int, model:Object=null):Boolean
		{
			return false;
		}
	}
}

                                              

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