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/ViewerRow.java
/**
	 * Return the bounds for the whole item.
	 * @return Rectangle
	 */
	public abstract Rectangle getBounds();
	/**
	 * Return the item for the receiver.
	 * @return Item
	 */
	public abstract Item getItem();
	/**
	 * Return the number of columns for the receiver.
	 * @return int
	 */
	public abstract int getColumnCount();
	
	/**
	 * Return the image at the columnIndex.
	 * @param columnIndex
	 * @return Image
	 */
	public abstract Image getImage(int columnIndex);
	
	/**
	 * Set the image at the columnIndex
	 * @param columnIndex
	 * @param image
	 */
	public abstract void setImage(int columnIndex,Image image);