window placement upon startup

[Robert Roebling <roebling ruf uni-freiburg de>]

  Hi,

how do I position a dialog or window when showing
it for the first time using GTK 1.2.3 and the 
window manager from KDE 1.0. I have no problems
positioing it after it gets mapped, but that
entails that the dialog comes up just about anywhere
in screen and then gets moved to the correct place
(usually centered) - which, of course, looks ridiculous.

Thanks for any advice,

  Robert