Systray Icons under WinCE

I am using Shell_NotifyIcon() to try to add an Icon to the Systray under WinCE 2.0. An extra "slot" is created for it when I call Shell_NotifyIcon() with NIM_ADD, but no icon is displayed. I have called LoadIcon() and received a valid HICON handle. When I call Shell_NotifyIcon() with NIM_MODIFY, the icon is still not displayed. NIM_DELETE removes the extra "slot" from the Systray. Am I missing some necessary step that is particular to WinCE. This code works fine under Win95/98/NT4.0.

Compiler VC++ 6.0 and CE Toolkit for VC++ 6.0.
SH3 based WinCE devices (Cassiopeia PA-2400 and LG Phenom)