GtkWidget *dest = get_widget_assert (xml, "variables-treeview");
GtkWidget *selector1 = get_widget_assert (xml, "psppire-selector2");
GtkWidget *selector2 = get_widget_assert (xml, "psppire-selector3");
GtkWidget *dest = get_widget_assert (xml, "variables-treeview");
GtkWidget *selector1 = get_widget_assert (xml, "psppire-selector2");
GtkWidget *selector2 = get_widget_assert (xml, "psppire-selector3");