   document has a error.
  The WM_SHOWWINDOW message is not sent under the following circumstances: When a top-level, overlapped window is created with the WS_MAXIMIZE or WS_MINIMIZE style. When the SW_SHOWNORMAL flag is specified in the call to the ShowWindow function.if SW_SHOWNORMAL is specified,and the WM_SHOWWINDOW will be sent. right?   
  What document?   ;  msdn   ;  He's probably referring to the msdn win32api documentation.I have no real experience in that sort of area but i would assume that the documentation is correct.......   