GTK+ PopUp Window make it Transparent...

[Wolfman <murat sari team-bytestorm com>]

I use WinXP with GTK+ 2.8.18

This dont work the colormap is always null...

GdkScreen *screen = gtk_widget_get_screen(widget);
GdkColormap *colormap = gdk_screen_get_rgba_colormap(screen);

Is there a other way to make a window transparent? And why this doesnt work
under WinXP?I know in *NIX u need a composite manager do i need this under
winxp?
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