hi! anybody can explain me why i have to use the AdjustWindowRecEx function? isnt it possible just to pass the requested size to the CreateWindowEx function?? best regards trigger

AdjustWindowRectEx calculates which size you have to pass to CreateWindow in order to get the CLIENT ARENA of the window the requested size. if you dont use AdjustWindowRectEx the size you pass to CreateWindowEx is the size of the whole window, and the client arena is overlapped by the borders and title...