[flexcoders] Can't move titlewindow in an Application

[xmwang1982]

Hi experts,

I have a class inheriting TitleWindow, and I add the following code to enable 
drag/drop of the title window by press on the title bar:

private function onCreationComplete(evt:Event):void
                        {
                                
this.titleBar.addEventListener(MouseEvent.MOUSE_DOWN, startDragWin);
                                
this.titleBar.addEventListener(MouseEvent.MOUSE_UP, stopDragWin);
                                
this.titleBar.addEventListener(MouseEvent.MOUSE_OUT, stopDragWin);              
                
                                this.addEventListener(DragEvent.DRAG_DROP, 
moveSelf);
                        }
                        
                        private function moveSelf(evt:DragEvent):void
                        {
                                this.x = evt.stageX;
                                this.y = evt.stageY;                            
                        }
                        
                        private function startDragWin(evt:MouseEvent):void
                        {

                                
                                this.startDrag();
                        }
                        

                        
                        private function stopDragWin(evt:MouseEvent):void
                        {
                                
                                this.stopDrag();
                        }


I added the object as the top level child of an application. However the 
settings of x and y are not working. The window is not moved.

I have been confused for long. Any possible reason?

Layout of application is: layout="absolute"

The following attributes were set for the title window in the MXML of the 
application 

<MyTitleWindow backgroundAlpha="0.5" bottom="10" right="10" width="400" 
height="300"...>

I guess these initial settings don't matter at all.

Please suggest. Thanks in advance.