I make a program using Visual C++ 6,

I put an icon on the system tray using Shell_NotifyIcon(),

I register a callback message using RegisterWindowMessage() to notify when the icon gets clicked,

but when I click the icon nothing happens and the message handler does not execute

I think the problem exists in the definition of the custom callback message, I need to know exactly how can I make it, thanks a lot

Problem solved!
I used ON_MESSAGE instead of ON_REGISTERED_MESSAGE so that I don't need RegisterWindowMessage()

with ON_MESSAGE I used #define MYWM_MESSAGE 33000 and this doesn't work, instead I used const UINT MYWM_MESSAGE = 33000