Disabling a menu item on a dialog menu

I have an VC 6.0 app.  In design time, I created a menu on the main dialog.  The resource ID is IDR_MAINFRAME.  Like many windows programs, this menu has three menus.  From left to right, the menus are "File", "View", and "Help".  On my "View" menu, I want to be able to enable/disable the fourth menu item, during runtime, depending on the user's input.

I've tried processing the ON_UPDATE_COMMAND_UI message for the menu item, but my message handler function is never getting called.  If I use the resource ID of the first menu item in the "View" menu,  in connection with ON_UPDATE_COMMAND_UI.  In this case, my message handler function DOES get called.  But then how do I reference the fourth menu item?

Thanks ahead of time.
clintonJAsked:
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Jaime OlivaresConnect With a Mentor Software ArchitectCommented:
it should work, no matters if it is the first or fourth.
maybe you missed something, is the function correctly declared and implemented? like:

void CYourMainDlg::OnUpdateYourFunction(CCmdUI* pCmdUI)
{
}

also, how do you determine it is called? are you sure of that?
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clintonJAuthor Commented:
Sometimes I get tripped up by the obivous.  :0  The message handler for the ON_UPDATE_COMMAND_UI message was already implemented when I inherited this code.  I didn't realize this.  Thus, the original author's message handler function was getting called, which of course was preventing mine from getting called.
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