Bug 137849 Unable to set comparator in StructuredViewer
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/StructuredViewer.java
}
	/**
	 * 
	 * Refreshes the given TableItem with the given element. Calls
	 * <code>doUpdateItem(..., false)</code>.
	 * <p>
	 * This method is internal to the framework; subclassers should not call
	 * this method.
	 * </p>
	 * @param widget
     *            the widget
	 * @param element
     *            the element
	 */
	protected final void refreshItem(Widget widget, Object element) {
		SafeRunnable.run(new UpdateItemSafeRunnable(widget, element, true));
	}
	/**
	 * Removes the given open listener from this viewer. Has no affect if an
	 * identical listener is not registered.
	 * 
	 * @param listener
	 *            a double-click listener
	 */
	public void removeOpenListener(IOpenListener listener) {
		openListeners.remove(listener);
	}
	/*
	 * (non-Javadoc) Method declared on IPostSelectionProvider.
	 */