BOOL ShowWindow( int nCmdShow );
See ShowWindow in the Win32 SDK.
Remarks
Example
//The following example attaches an HWND to the CWindow object and
//calls CWindow::ShowWindow() to show the window in its maximized state
CWindow myWindow;
myWindow.Attach(hWndFoo);
myWindow.ShowWindow(SW_SHOWMAXIMIZED);
Sets the window's show state.