code: def OnTimer(self, event):
          
  
          self.timer_updating = True
  
          shape = self.grid.code_array.shape[:2]
          selection = Selection([(0, 0)], [(shape)], [], [], [])
          self.grid.actions.refresh_selected_frozen_cells(selection)
          self.grid.ForceRefresh()
docs: Update all frozen cells because of timer call