Hola, para deshabilitar la propiedad resizable al dialogo:
index 90965f9..1d4ac9d 100644
--- a/source/winapi/dialogs.c
+++ b/source/winapi/dialogs.c
@@ -24,6 +24,8 @@ HB_FUNC( CREATEDIALOG )
gtk_widget_realize( hWnd );
gdk_window_set_decorations( hWnd->window, GDK_DECOR_TITLE );
gtk_window_set_default_size( GTK_WINDOW( hWnd ), 100, 100 );
+
-
gtk_window_set_resizable( GTK_WINDOW( hWnd ), FALSE );
gtk_signal_connect( GTK_OBJECT( hWnd ), "delete_event",
GTK_SIGNAL_FUNC( ( GtkSignalFunc ) DeleteEvent ), NULL );