tt_d.vars_treeview = get_widget_assert (xml, "one-sample-t-test-treeview1");
tt_d.test_value_entry = get_widget_assert (xml, "test-value-entry");
tt_d.opt = tt_options_dialog_create (xml, GTK_WINDOW (de));
tt_d.vars_treeview = get_widget_assert (xml, "one-sample-t-test-treeview1");
tt_d.test_value_entry = get_widget_assert (xml, "test-value-entry");
tt_d.opt = tt_options_dialog_create (xml, GTK_WINDOW (de));