[pygtk] Special Keys for Accelerators

[JSeipp]

Hello,
i have searched everywhere but couldn't find a solution to this:

How do I assign an accelerator to a special key combination like "Ctrl" 
+ "Page-Up" ?

Widget.add_accelerator('clicked', self.accel_group, ord('U'), 
gtk.gdk.CONTROL_MASK, gtk.ACCEL_VISIBLE)  works for single letters like 
"U", but how can I get the keyval for "Page-Up". Any ideas?

Thanks in advance,
Jendrik