Popup Window with Spark (Solved Dragging Isuue)

package 
{
 import flash.events.Event;

 import mx.core.FlexGlobals;
 import mx.events.CloseEvent;
 import mx.events.FlexEvent;
 import mx.logging.ILogger;
 import mx.managers.PopUpManager;

 import spark.components.TitleWindow;
 import spark.events.TitleWindowBoundsEvent;

 /**
  * This TitleWindow is designed so that the window cannot be dragged outside
  * the boundaries of the application. This component is made to be opened with <code>PopUpManager</code>
  * so that when it is closed, it will be removed from <code>PopUpManager</code>.
  * @author rrubalcava
  */
 public class PopUpWindow extends TitleWindow
 { 
  public function PopUpWindow()
  {
   super();
   this.addEventListener(FlexEvent.CREATION_COMPLETE, onCreationComplete_handler, false, 0, true);
   this.addEventListener(CloseEvent.CLOSE, onCloseClicked_handler, false, 0, true);
   this.addEventListener(TitleWindowBoundsEvent.WINDOW_MOVE, onTitleWindowMove_handler, false, 0, true);
  }

  /**
   * Right position of window when it opens.
   * @default
   */
  public var popupRight:Number;
  /**
   * Left position of window when it opens.
   * @default
   */
  public var popupTop:Number;

  /**
   * X postion of window when it opens.
   * @default
   */
  public var popupX:Number;
  /**
   * Y postion of window when it opens.
   * @default
   */
  public var popupY:Number;

  /**
   * Will remove all elements and this window from <code>PopUpManager</code>.
   * @param e
   */
  protected function onCloseClicked_handler(e:CloseEvent):void
  {
   this.removeEventListener(CloseEvent.CLOSE, onCloseClicked_handler);

   this.removeAllElements();
   PopUpManager.removePopUp(this);
  }

  /**
   * Will assign given position assignments when window is created.
   * @param e
   */
  protected function onCreationComplete_handler(e:FlexEvent):void
  {
   this.removeEventListener(FlexEvent.CREATION_COMPLETE, onCreationComplete_handler);
   if (popupX > 0)
    this.x = popupX;
   else if (popupRight > 0)
    this.right = popupRight;
   if (popupY > 0)
    this.y = popupY;
   else if (popupTop > 0)
    this.top = popupTop;
  }

  /**
   * Repositions window so that it cannot be dragged outside of <code>Application</code> area.
   * @param event
   */
  protected function onTitleWindowMove_handler(event:Event):void
  {
   var w:Number = FlexGlobals.topLevelApplication["width"];
   var h:Number = FlexGlobals.topLevelApplication["height"];
   if (this.x < 0)
    this.x = 5;
   if (this.y < 0)
    this.y = 5;
   if (this.x > w - 25)
    this.x = w - this.width;
   if (this.y > h - 25)
    this.y = h - this.height;
  }
 }
}