g_signal_connect(G_OBJECT(multi_vpaned->hscrollbar), "value-changed",
G_CALLBACK(gtk_multi_vpaned_scroll_value_changed), multi_vpaned);
g_signal_connect(G_OBJECT(multi_vpaned->hscrollbar), "value-changed",
G_CALLBACK(gtk_multi_vpaned_scroll_value_changed), multi_vpaned);