Unregisters previously registered OnHelpButtonClick event handler.
Event handler to unregister.
ACustom [in, optional]
(for procedural event handlers only)
Custom pointer to be passed into handler.
Must be the same pointer which was passed to event registration routine.
If the specified event handler wasn't registered - does nothing. Otherwise handler is removed and it will be no longer be invoked.
It's best to call this routine in object's destructor (for method event handlers) or unit's finalization section (for procedural event handlers).
Build date: 2021-10-15
Last edited: 2021-10-15
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