Weak Function Refs

<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009" 
					   xmlns:s="library://ns.adobe.com/flex/spark" 
					   xmlns:mx="library://ns.adobe.com/flex/mx"
					   creationComplete="onCreationComplete(event)">

	<fx:Script>
		<![CDATA[
			import mx.controls.List;
			import mx.events.FlexEvent;
			
			protected var _listeners : Dictionary;
			
			protected function onCreationComplete(event:FlexEvent):void
			{
				_listeners = new Dictionary();
			}
			
			protected function onCheckClicked(event:MouseEvent):void
			{
				var o : Object = {};
				o.dispatch = function() : void { trace("dispatched"); }					
				_listeners[o.dispatch] = 0;
			}	
			
			protected function onRunGCClicked(event:MouseEvent):void
			{
				// Force a GC
				try 
				{
					new LocalConnection().connect('foo');
					new LocalConnection().connect('foo');
				} 
				catch (e:*) {}								
			}		
			
			protected function onDispatchClicked(event:MouseEvent):void
			{		
				for (var listener : * in _listeners) 
				{
					listener();	
				}
			}		

		]]>
	</fx:Script>	
	
	<s:VGroup width="100%" height="100%" horizontalAlign="center" verticalAlign="middle">
		<s:Button label="Add Listener" click="onCheckClicked(event)" />
		<s:Button label="Run GC" click="onRunGCClicked(event)" />
		<s:Button label="Dispatch" click="onDispatchClicked(event)" />
	</s:VGroup>
	
</s:WindowedApplication>