code: def modver(self, *args):
          
          g = get_root(self).globals
          if self.ok():
              tname = self.val.get()
              if tname in self.successes:
                  # known to be in simbad
                  self.verify.config(bg=g.COL['start'])
              elif tname in self.failures:
                  # known not to be in simbad
                  self.verify.config(bg=g.COL['stop'])
              else:
                  # not known whether in simbad
                  self.verify.config(bg=g.COL['main'])
              self.verify.config(state='normal')
          else:
              self.verify.config(bg=g.COL['main'])
              self.verify.config(state='disable')
  
          if self.callback is not None:
              self.callback()
docs: Switches colour of verify button