You could always try calling the SetWindowPos function and pass it NULL,0,0,0,0,SWP_NOMOVE |SWP_NOSIZE | SWPNO_ZORDER | SWP_SHOWWINDOW.
This will show a window without moving, sizing or changing the zorder.
e.g
SetWindowPos(NULL,0,0,0,0,SWP_NOMOVE |SWP_NOSIZE | SWP_NOZORDER | SWP_SHOWWINDOW)...