Getting a GdkPixbuf from any GtkImage

[Andrew Smith <asmith15 littlesvr ca>]

Hi

I have a function that makes a GdkPixbuf from whatever, and I want to 
use gtk_image_new_from_stock(GTK_STOCK_MISSING_IMAGE) as a fallback.

But I can't use gtk_image_get_pixbuf() on that image, apparently because 
a GdkPixbuf wasn't used to crate it, or something.

Help?

Thanks in advance,

Andrew