THintEvent is the type of the OnHint event handler.
THintEvent = procedure (var HintStr: string; var CanShow: Boolean) of object;
(var HintStr: string; var CanShow: Boolean) ( THintEvent)();
HintStr is the string that will appear in the pop-up help hint. The event handler can change this string to change the hint that appears to the user.
CanShow indicates whether the hint specified by HintStr should be shown using the default popup window after the event handler exits. Set this to false to suppress the default behavior when the event handler displays the hint.
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