display dialogbox in thread

hi:


Environment : Windows 95/NT, Visual C++ 6.0 SP2


I have a strange problem. I create two thread. one is prime thread, others is non-prime thread

In non-prime thread , I create a "MODEL" dialogbox. and I use following code to set dialogbox 'topmost'


SetWindowPos(&wndTopMost,0,0,0,0,SWP_NOSIZE|SWP_NOMOVE);


but I find that the dialogbox display sometimes and do not display sometimes.

when dialogbox do not display, the application is hung up .

I think if threads compete resource unsuccessfully. because I update the icon of frame every 200ms In main thread.

I do not know how to solve.


any help need

Thanks in advance


Regards

Sunway Xiao