Q: gtk geometry and client aspect ration

Hi, this may be a newbe question, but it drives me crazy ;(

A very simple app (using glade):

- window1
-- vbox1
--- scrolledwindow1
---- drawingarea1
--- statusbar1

Now I want drawingarea1 to be squared, so:

void
on_drawingarea1_realize (GtkWidget *widget, gpointer user_data)
{
   GdkGeometry geometry;

   geometry.min_aspect = geometry.max_aspect = 1.0;
   gtk_window_set_geometry_hints (window1, widget, &geometry, 
GDK_HINT_ASPECT);
}

But this squares the *window*, not the *drawingarea*, which was passed 
on as the geometry_widget ;(.
Any help would be greatly apreciated.

TIA,
Johan