Shifted area of button sensitivity in not decorated windows

[Joost <joost h-labahn de>]

Hello,

not the first time i encounter the following
problem under WindowsXP: In a not decorated
toplevel window the area of sensitivity for
button events is shifted downward.

Leaving a gap on the window, where no button
events are "emitted", with the height of the
missing OS-frame (about 22 pixels).

I have a vague remembrance to have read
about that problem in the GTK documentation
(or elsewhere on the web ?) and even a way to
correct this, but cannot find it again (did i
dream that ?). Even if i should succeed in working
around this problem for today, i'd like to know
that text.

Thanks for reading, Joost Behrends