Код AS1/AS2:

_root.attachMovie("clip","clip",1000);
 
add_btn.onPress = function(){//добавить ComboBox
	_root.clip.attachMovie("ComboBox","com1",2100);
	trace("Depth ComboBox > "+_root.clip.com1.getDepth());//Depth ComboBox > 2100
}
 
del_btn.onPress = function(){//удалить клип
trace("_root.clip.getDepth() > "+_root.clip.getDepth());//_root.clip.getDepth() > 1000
trace("_root.clip.com1.getDepth() > "+_root.clip.com1.getDepth());//_root.clip.com1.getDepth() > 2100
_root.clip.removeMovieClip();
trace("AFTER del, ComboBox > "+_root.clip.com1);//AFTER del, ComboBox > _level0.clip.com1
trace("AFTER del, clip > "+_root.clip);//AFTER del, clip > _level0.clip
}