• Include the definition of OnMouseUp() from the super class, System.Windows.Forms.Panel
• Add a message box that displays the coordinates of the event.

You may want to specify that the new function is overriding the super class and is protected against further overriding by other classes that may inherit it:

  override protected function OnMouseUp (e : MouseEventArgs) {
    super.OnMouseUp(e);
    MessageBox.Show("Mouse Up at: "+e.X+", "+ e.Y);
  } 

  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);
    } 
  } 

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