class ClickPanel extends System.Windows.Forms.Panel {
    override protected function OnMouseUp (e : MouseEventArgs) {
      super.OnMouseUp(e);
      MessageBox.Show("Mouse Up at: "+e.X+", "+ e.Y);
    } 
  } 

  private var topPanel: ClickPanel;

  topPanel= new ClickPanel;

  Application.Run(new MouseUpPkg.MouseUpCls());

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