In meiner OH steht geschrieben:
Set Hint to a string that provides more information about the meaning of the menu item than the Caption. The hint text appears in a Help Hint window when the user pauses with the mouse over the menu item if Help Hints are enabled (that is, if the Form’s and the Application’s ShowHint properties are true). It is also available for the code in the application’s OnHint event handler.
Zu deutsch:
ShowHint muss auf true gesetzt sein...
Fazit: Erst OH, dann suchen, dann fragen 