fRequester= (model instanceof IProblemRequestor) ? (IProblemRequestor) model : null;
fRequestor= (model instanceof IProblemRequestor) ? (IProblemRequestor) model : null;
	private void updateProblemRequester() {		IAnnotationModel model= fEditor.getDocumentProvider().getAnnotationModel(fEditor.getEditorInput());		fRequester= (model instanceof IProblemRequestor) ? (IProblemRequestor) model : null;	}