if (fContentAssistSubjectControl instanceof IWidgetTokenOwner)
owner= (IWidgetTokenOwner) fContentAssistSubjectControl;
else if (fViewer instanceof IWidgetTokenOwner)
owner= (IWidgetTokenOwner) fViewer;
if (owner != null)
owner.releaseWidgetToken(this);
}
}
/**
* Unregisters a content assist listener.