editor: SellableTaxConstantEditor
GtkDialog(main_dialog.toplevel): title='Add Taxes and Tax rates', hidden
  GtkVBox(main_dialog._main_vbox):
    GtkVBox(main_dialog.vbox, expand=True, fill=True):
      GtkEventBox(main_dialog.header):
      GtkEventBox(main_dialog.main, expand=True, fill=True, padding=6):
        GtkEventBox(): slave BasicForm is attached
          GtkAlignment(toplevel):
            GtkTable():
              ProxyLabel(description_lbl): 'Name:'
              ProxyEntry(description): '', mandatory
              ProxyLabel(tax_value_lbl): 'Value:'
              ProxySpinButton(tax_value): '', mandatory
      GtkHBox(fill=True):
        GtkEventBox(main_dialog.extra_holder, expand=True, fill=True, padding=6):
        GtkEventBox(main_dialog.print_holder, expand=True, fill=True):
        GtkEventBox(main_dialog.notice, fill=True):
        GtkEventBox(main_dialog.details_holder, padding=6, pack-end):
    GtkHButtonBox(fill=True, pack-end):
      GtkButton(main_dialog.cancel_button, expand=True, fill=True, padding=6): 'gtk-cancel'
      GtkButton(main_dialog.ok_button, expand=True, fill=True, padding=6): 'gtk-ok', insensitive
