g_object_get (vs, "dictionary", &tt_d.dict, NULL);
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");
g_object_get (vs, "dictionary", &tt_d.dict, NULL);
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");