garbage collection in aswing framework

JFrame is not GC ??

//create a frame
var f:JFrame = new JFrame(this);
//......
//some children add in this JFrame
f.show();

//......
//and final we dispose it
f.closeReleased(); //this method will call it's dispose() method
f = null;


/*
*  I use flashdevelop's 'swf profiler' tool to 'check Memory' and 'live objects count'
*  and more instance created with JFrame is not gc. (they still in memory).
*  wait a moment, I use gskinner's hack method (call "new LocalConnection().connect('same name')" twice).
*  and found still not gc, too.
*
*  I guess the reason is that Jfram has more parent chain, and they create more event listener, and *dispose() method do not remove these event listener.
* 
*/