Bug 154064 Need a way to access the TreeItem or TableItem on a refresh
It is not currently possible to know when an item is refreshed. This is required for ownerDraw support in viewers.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TableViewer.java
* @since 3.1
	 */
	public void replace(Object element, int index) {
		TableItem item = getTable().getItem(index);
		refreshItem(item, element);
	}
	/**
	 * Clear the table item at the specified index
	 * 
	 * @param index
	 *            the index of the table item to be cleared
	 * 
	 * @since 3.1
	 */
	public void clear(int index) {
		TableItem item = getTable().getItem(index);
		if (item.getData() != null) {
			disassociate(item);
		}
		table.clear(index);
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.viewers.StructuredViewer#getRawChildren(java.lang.Object)
	 */
	protected Object[] getRawChildren(Object parent) {
		Assert.isTrue(!(getContentProvider() instanceof ILazyContentProvider),
				"Cannot get raw children with an ILazyContentProvider");
		return super.getRawChildren(parent);