docs: def paintEvent( self, event ):
          """
          Overloads the paint event for this group box if it is currently
          collpased.
          
          :param      event | <QPaintEvent>
          """
          if ( self.isCollapsed() ):
              self.setFlat(True)
          
          elif ( self.isCollapsible() ):
              self.setFlat(False)
              
          super(XGroupBox, self).paintEvent(event)