pda->source = get_widget_assert (xml, "indep-samples-treeview1");
act->define_groups_button = get_widget_assert (xml, "define-groups-button");
act->options_button = get_widget_assert (xml, "indep-samples-options-button");
pda->source = get_widget_assert (xml, "indep-samples-treeview1");
act->define_groups_button = get_widget_assert (xml, "define-groups-button");
act->options_button = get_widget_assert (xml, "indep-samples-options-button");