this.addEventListener(TitleWindowBoundsEvent.WINDOW_MOVE,function(event:Event):void{
event.target.x = event.target.x < 0 ? 0 : event.target.x;
if(event.target.x + event.target.width > event.target.parent.width){
if(event.target.parent.width - event.target.width < 0){
event.target.x = 0;
}else{
event.target.x = event.target.parent.width - event.target.width;
}
}
event.target.y = event.target.y < 0 ? 0 : event.target.y;

if(event.target.y + event.target.height > event.target.parent.height ){
if(event.target.parent.height - event.target.height < 0){
event.target.y = 0;
}else{
event.target.y = event.target.parent.height - event.target.height;
}
}
});