def InitSpecCheck(self):
        """
        make an interactive grid in which users can edit specimen names
        as well as which sample a specimen belongs to
        """
        #wait = wx.BusyInfo("Please wait, working...")
        #wx.SafeYield()
        self.contribution.propagate_lithology_cols()
        spec_df = self.contribution.tables['specimens'].df
        self.panel = wx.Panel(self, style=wx.SIMPLE_BORDER)
        self.grid_frame = grid_frame3.GridFrame(self.contribution, self.WD,
                                                'specimens', 'specimens', self.panel,
                                                 main_frame=self.main_frame)
        # redefine default 'save & exit grid' button to go to next dialog instead
        self.grid_frame.exitButton.SetLabel('Save and continue')
        grid = self.grid_frame.grid
        self.grid_frame.Bind(wx.EVT_BUTTON,
                             lambda event: self.onContinue(event, grid, self.InitSampCheck),
                             self.grid_frame.exitButton)

            # add back button
        self.backButton = wx.Button(self.grid_frame.panel, id=-1, label='Back',
                                      name='back_btn')
        self.backButton.Disable()
        self.grid_frame.main_btn_vbox.Add(self.backButton, flag=wx.ALL, border=5)
        # re-do fit
        self.grid_frame.do_fit(None, self.min_size)
        # center
        self.grid_frame.Centre()
        return