Adds the listener to the collection of listeners who will be notified when help events are generated for the control, by sending it one of the messages defined in the HelpListener interface.
@param listener the listener which should be notified
@exception IllegalArgumentException
ERROR_NULL_ARGUMENT - if the listener is null
@exception SWTException
ERROR_WIDGET_DISPOSED - if the receiver has been disposed
ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
Adds the listener to the collection of listeners who will be notified when the help events are generated for the control, by sending it one of the messages defined in the HelpListener interface.
@param listener the listener which should be notified
@exception IllegalArgumentException
ERROR_NULL_ARGUMENT - if the listener is null
@exception SWTException
ERROR_WIDGET_DISPOSED - if the receiver has been disposed
ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
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