def _initialize_ui(self):
        table = self.document.table
        main_sizer = wx.BoxSizer(wx.VERTICAL)
        panel = shared.ScrolledPanel(self)
        panel_sizer = wx.BoxSizer(wx.VERTICAL)

        # Here I'm creating one row of text controls for every column in the
        # table. All the text controls go in a list for later value extraction.
        for index in table.column_indexes:
            row_sizer = wx.BoxSizer(wx.HORIZONTAL)

            label = wx.StaticText(
                panel, -1, str(index + 1), size=(15, -1), style=wx.ALIGN_RIGHT
            )
            row_sizer.Add(label, 0, wx.ALIGN_CENTER_VERTICAL | wx.RIGHT, 5)

            tc = wx.TextCtrl(self, -1)
            self.text_controls.append(tc)
            row_sizer.Add(tc, 1, wx.EXPAND | wx.ALIGN_CENTER_VERTICAL)

            panel_sizer.Add(row_sizer, 0, wx.EXPAND | wx.ALL, 5)

        panel.SetSizer(panel_sizer)
        panel.Layout()

        main_sizer.Add(panel, 0, wx.EXPAND)
        main_sizer.AddStretchSpacer()
        main_sizer.Add(wx.StaticLine(self, -1), 0, wx.EXPAND | wx.ALL, 5)
        main_sizer.Add(self.CreateStdDialogButtonSizer(wx.OK | wx.CANCEL),
                       0, wx.ALIGN_CENTER | wx.BOTTOM, 5)

        self.SetSizerAndFit(main_sizer)