Overloads the focus out event to cancel editing when the widget loses
        focus.
        
        :param      event | <QFocusEvent>

def focusOutEvent( self, event ):
        """
        Overloads the focus out event to cancel editing when the widget loses
        focus.
        
        :param      event | <QFocusEvent>
        """
        super(XNavigationEdit, self).focusOutEvent(event)
        
        self.cancelEdit()