Possible to get GtkWindow from a GdkWindow

[Grim S <grims_6 yahoo com>]

Hello,
I have access to a GdkWindow, and was wondering if it
could be possible to get tot he GtkWindow? More
generally, the way i understood is that GdkWindow is a
wrapper for X, and GtkWindow is a higher level entity.
How does one get to the Gtk widgets (like GtkButton
etc.) from X? 
Regards.


                
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