|Use the SetWindowPos API function on your hWnd.
Take a look in MSDN about how to use it. Or maybe this is enough, I took it for you:
BOOL SetWindowPos( HWND hWnd,
Put hWndInsertAfter = "HWND_TOPMOST" and then at uFlags SWP_NOMOVE and SWP_NOSIZE and SWP_NOACTIVATE, depending on what exactly you wish to do. More details about all those in MSDN :- D.
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The Greater Mind Balance