def InitSiteCheck(self):
        """
        make an interactive grid in which users can edit site names
        as well as which location a site belongs to
        """
        # propagate average lat/lon info from samples table if
        # available in samples and missing in sites
        self.contribution.propagate_average_up(cols=['lat', 'lon', 'height'],
                                       target_df_name='sites',
                                       source_df_name='samples')
        # propagate lithology columns
        self.contribution.propagate_lithology_cols()

        site_df = self.contribution.tables['sites'].df
        self.panel = wx.Panel(self, style=wx.SIMPLE_BORDER)
        self.grid_frame = grid_frame3.GridFrame(self.contribution, self.WD,
                                                'sites', 'sites', 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.InitLocCheck),
                             self.grid_frame.exitButton)
        # add back button
        self.backButton = wx.Button(self.grid_frame.panel, id=-1, label='Back',
                                      name='back_btn')
        self.Bind(wx.EVT_BUTTON,
                  lambda event: self.onbackButton(event, self.InitSampCheck),
                  self.backButton)
        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
make an interactive grid in which users can edit site names
        as well as which location a site belongs to