Add MovieClip to mx.Panel

programming flash
1

Hi!
I want to add MoovieClips to the Panel.

var panel:Panel = new Panel();
var myrecord:MovieClip = new MovieClip();
panel.addChild(myrecord);

I get this error:
TypeError: Error #1034: Type Coercion failed: cannot convert flash.display::MovieClip@4506f71 to mx.core.IUIComponent.

Can you help me?
Thx