Mdi child's system menu is gone

Hi there,

mdi app with mdi clients showing pictures (paintshop pro like).
When I create a new client window and the others are maximized,
the new client is also maximized. Fine.
But bringing it to normal state, the others loose their
system menu :(
Adding the menu (brute force method) with a mdichildcount loop
shows no effect.
All buttons are gone :(
Choosing such a window, maximizing (double click on caption frame) and
normalizing it brings back the menu/buttons.

Anyone knows whats wrong?

Thanx for your help,


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