title: How do I get the gdk window for a gtk window in C?
body: <p>I'm trying to set the cursor to a watch. The problem is that gdk_set_cursor() requires a gdk_window.</p>
  <p>How do I get the gdk_window of a gtk_window in C? I've seen examples for gtkmm and pygtk but I can't find the corresponding C function.</p>