GtkWidget *var_selector = get_widget_assert (xml, "compute-selector1");
GtkWidget *func_selector = get_widget_assert (xml, "compute-selector2");
GtkWidget *type_and_label = get_widget_assert (xml, "compute-button1");
GtkWidget *var_selector = get_widget_assert (xml, "compute-selector1");
GtkWidget *func_selector = get_widget_assert (xml, "compute-selector2");
GtkWidget *type_and_label = get_widget_assert (xml, "compute-button1");