SimpleDispatcher.as

package
{
	import flash.utils.Dictionary;

	public class SimpleDispatcher
	{
		protected var _listeners : Dictionary;
		
		public function SimpleDispatcher(useWeak:Boolean)
		{
			_listeners = new Dictionary(useWeak);
		}
		
		public function add(f:Function) : void
		{
			_listeners[f] = true;
		}
		
		public function dispatch() : void
		{
			for (var o:* in _listeners)
			{
				o();
			}
		}
	}
}

SimpleListener.as

package
{
	public class SimpleListener
	{
		public function SimpleListener(d:SimpleDispatcher)
		{
			d.add(onPing);
		}
		
		protected function onPing() : void
		{
			trace(this+" - ping");
		}
	}
}

SimpleWeakTest.mxml

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
			   xmlns:s="library://ns.adobe.com/flex/spark" 
			   xmlns:mx="library://ns.adobe.com/flex/mx">
	
	<fx:Script>
		<![CDATA[
			import mx.controls.List;
			
			protected var _dispatcher : SimpleDispatcher = new SimpleDispatcher(true);
			protected var _listener : SimpleListener;
					
			protected function onAddListenerClicked(event:MouseEvent):void
			{
				_listener = new SimpleListener(_dispatcher);
			}	
			
			protected function onRunGCClicked(event:MouseEvent):void
			{		
				try 
				{
					new LocalConnection().connect('foo');
					new LocalConnection().connect('foo');
				} 
				catch (e:*) {}								
			}				
			
			protected function onDispatchClicked(event:MouseEvent):void
			{		
				_dispatcher.dispatch();
			}		
			
		]]>
	</fx:Script>	
	
	<s:VGroup width="100%" height="100%" horizontalAlign="center" verticalAlign="middle">
		<s:Button label="Add Listener" click="onAddListenerClicked(event)" />
		<s:Button label="Run GC" click="onRunGCClicked(event)" />
		<s:Button label="Dispatch" click="onDispatchClicked(event)" />
	</s:VGroup>
	
	
</s:Application>