- GtkButton* button = create_dialog_button( "Cancel", G_CALLBACK( dialog_button_cancel ), &modal );
- gtk_box_pack_start( GTK_BOX( vbox ), GTK_WIDGET( button ), FALSE, FALSE, 0 );
+ auto button = create_dialog_button( "Cancel", G_CALLBACK( dialog_button_cancel ), &modal );
+ vbox.pack_start( button, FALSE, FALSE, 0 );