docs: def onThemeColor(self, color, item):
          """pass theme colors to bottom panel"""
          bconf = self.panel_bot.conf
          if item == 'grid':
              bconf.set_gridcolor(color)
          elif item == 'bg':
              bconf.set_bgcolor(color)
          elif item == 'frame':
              bconf.set_framecolor(color)
          elif item == 'text':
              bconf.set_textcolor(color)
          bconf.canvas.draw()