Todo elemento de delphi tiene la propiedad HelpCOnntext... y para que no haya equivocaciones aqui te pego lo que sale en la ayuda.
Cita:
Provides a context number for use in calling context-sensitive online Help.
property HelpContext: THelpContext;
Description
Assign a value to HelpContext to determine which help screen appears when the user presses F1 to request help.
Each screen in the Help system should have a unique context number. When a control is selected in the application, pressing F1 displays a Help screen. Which Help screen appears depends on the value of the HelpContext property.
If HelpContext is zero, then the control inherits the help context of its parent control. For example, if a button with a HelpContext of zero is contained in a form with a non-zero help context and F1 is pressed, the context screen for the form will be shown.
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Espero que esto te sirva para algo...