Different behavior of movewindow with different windows is (xp or windows 7)

Question

we have a windows wpf stand alone application which must be integrated within a windows form 2.0 stand alone application. given to the particular implementation of the windows form application we decided to use a light integration trying to change the parent
handle of the wpf main window setting  as parent the handle of a windows of the windows form 2.0 application.
in order to reposition the wpf windows on top of the parent windows form window, we have a thread which keeps doing two operations: (1) invoke getwindowsrect on the parent windows form windows to get the parent absolute position and (2) invoke movewindow
on the wpf main window handle to reposition the window.
when we move the windows form window, the wpf windows follows the parent remaining in the correct position. we tested this solution with windows xp, windows 7, windows 8 in our office. when we went to the customer to complete the installation, both on a
windows xp and on a windows 7 the behavior was different. the size of the wpf window was much bigger than the size of the windows form parent window. back in office we found the same strange behavior in windows xp wirtual machine. in order to fix the problem
(at least partially) we had to change the operation sequence within our code as follows in the monitoring thread: (0) get parent windows position with getwindowrect (1) set the parent of the wpf main window to (null) 0 invoking setparent, (2) invoke the movewindow,
(3) re set the parent handler of the wpf main window to the handler of the windows form window.
with last solution it works but clearly there are more flikering when the window is moving or resizing respect to initial implementation.
any idea about this different behavior of movewindow function? any suggestion?
thanks
Paolo

Answer 1

Hi Paolo,
You'll need to post it in the dedicated WPF or Windows Forms forum for more efficient responses, where you can contact the experts.
http://social.msdn.microsoft.com/Forums/en-US/home?forum=wpf WPF forum
http://social.msdn.microsoft.com/Forums/windows/en-US/home?forum=winforms  Windows Forms forum
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