Eitan,
The HelpContextIDs and WhatsThisHelpID must match the ContextIDs that you set for the topic in the help file. WhatsThis help is limited to certain form types that makes it pretty useless IMHO. If you just set the HelpContextID of a form all the controls that have a HelpContextID of 0 will "inherit" the ID of the form.
>Has anyone out there got the context sensitive help mechanism to work?
>We're bashing our heads against VFP's documentation and coming up with only sore heads! We've created an .HLP file and an .HH map file and set the WhatsThisID's to the ID numbers in the map file and got the ? button on the title bar and got in the test form's INIT we have SET HELP TO X.HLP... but we don't know what to do with the WhatsThisMode method of the form (if anything) and the ShowWhatsThis method of the objects.