wxWindows -jdt

Has anyone got CSystemTray to work in an MDI app? I have heard that a WM_SHOWWINDOW message is caused by a call to SetWindowPlacement. However a grep "SetWindowPlacement" *.{cpp,h} of the MFC VC++ 6.0 sources reveals just two occurences in wincore.cpp. I was expecting to some more occurences in winmdi.cpp. I tried integrating CSystemTray into a fresh MDI app but still could not get it to work. I just want the app to react to the main window being maximised and minimised without the need for a button which explicitly instructs the app to dive into the system tray as is the case for the demo app and John Xavier's 'Address' program. Thanks, -jdt