Tracking flag changes from modules

[Viktor Griph]

Is there any way that the module interface allows keeping track of changes 
to the window flags of a window? Currently FvwmPager allows moving of 
FixedPosition mini-windows, but the main window does not move. Just 
checking for IS_FIXED in MoveWindow doesn't work if the FixedPosition flag 
was set after the window was added to the pager (i.e with 'WindowStyle 
FixedPosition') since the flags get outdated.

I've been looking some at the module interface, but I think that no 
message exist to indicate change in window flags. Is this correct?

/Viktor