code: def resize(self, width, height):
          
          self._width = width
          self._height = height
  
          # update radio buttons width
          for item in self._rbuttons:
              item.width = width
  
          # update radio buttons height
          if len(self._rbuttons) > 0:
              # work out the height of a button
              button_height = height
              
              if isinstance(height, int):
                  if height % len(self._rbuttons) != 0:
                      # if the height doesnt divide by the number of radio buttons give a warning
                      button_height = int(round(height / len(self._rbuttons)))
                      new_height = button_height * len(self._rbuttons)
                      utils.error_format("ButtonGroup height '{}' doesn't divide by the number of buttons '{}' setting height to '{}'.".format(height, len(self._rbuttons), new_height))
                  else:
                      button_height = int(height / len(self._rbuttons))
              
              for item in self._rbuttons:
                  item.height = button_height
  
          super(ButtonGroup, self).resize(width, height)
docs: Resizes the widget.
  
          :param int width:
              The width of the widget.
  
          :param int height:
              The height of the widget.