Drawing to layout->bin_window

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The GTKdocumentation says:

"When handling expose events on a GtkLayout, you must draw to GTK_LAYOUT (layout)->bin_window, rather than to GTK_WIDGET (layout)->window, as you would for a drawing area. "

But I get a compiler error saying that the structure has no member named bin_window.

In my expose_event handler, I have the following code:

GTK_LAYOUT(widget);
gdk_draw_drawable (GDK_DRAWABLE(widget->bin_window),widget->style->fg_gc[GTK_WIDGET_STATE(widget)], app->pixmap, event->area.x, event->area.y,event->area.x, event->area.y,event->area.width, event->area.height);
 

I cannot figure out why the above code produces this problem. Is there something wrong with my usage or is there a bug in GTK?

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