The OnHelpDone event is executed when Popup Help for a control terminates. This can either be when the user clears the Help Popup from the screen, or if there is no Popup assigned for the control that a user has clicked, or for a specific control when using the FocusHelp or ControlHelp method calls.
The usual use of this event is to raise a depressed "Help" speedbutton, as in the example below.
procedure TForm1.MFMHelp1HelpDone(Sender: TObject);
begin
SpeedButton.Down := False;
end;