This defenitly won't work out of the box!
A way to achieve this (didn't tried it by myself) is to catch the MOVING message from windows and reset the position in the callback
(see
http://msdn.microsoft.com/en-us/libr...8VS.85%29.aspx)
Usge with nsdialogs:
http://nsis.sourceforge.net/Docs/nsD...l#ref-onnotify
IMHO this is not very clever/userfriendly because you prohibit a base functionality from Windows. Try to rethink it. Probably there is a easier way to achieve what you want.