If you want a form to support context-sensitive help, set the WhatsThisButton and WhatsThisHelp properties on the form to True, and set the WhatsThisHelpID property to a corresponding help-file topic ID for any control on that form for which you want help to be displayed.
Unfortunately, the help isn’t shown if the control’s Enabled property is set to False. To solve this problem, create a label under the control with the same dimensions, and clear its caption to make it invisible. Set the WhatsThisHelpID property to the same value as the disabled control’s property.