GDK set_cursor

Hi, I'm trying to set a custom cursor on a window, the operation should be the following in C: cursor = gdk_cursor_new (GDK_WATCH); gdk_window_set_cursor (GTK_WIDGET (mainwindow)->window, cursor); gdk_cursor_unref (cursor); I can create a new cursor with $c = new GdkCursor(Gdk::WATCH); but I can't find a way to call gdk_window_set_cursor correctly. It's defined as GdkWindow::set_cursor but refers to 'this_ptr' in the source, when there's no object context to call it from; calling it statically fails: gdk_window_set_cursor(GDK_WINDOW(PHPG_OBJECT(this_ptr)), cursor); any ideas? - Markus