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
* provide colors and/or fonts.
	 * </p>
	 * <p>
	 * If the label provider implements the mixin interface ITooltipProvider, it
	 * can provide custom tooltips.
	 * </p>
	 */
	public void setLabelProvider(IBaseLabelProvider labelProvider) {
		Assert.isTrue(labelProvider instanceof ITableLabelProvider
				|| labelProvider instanceof ILabelProvider);
		clearColumnParts();
		super.setLabelProvider(labelProvider);
	}
	
	/**
	 * Clear the viewer parts for the columns
	 */
	private void clearColumnParts() {
		TableColumn[] columns = getTable().getColumns();
		if(columns.length == 0)
			getTable().setData(ViewerColumn.COLUMN_VIEWER_KEY,null);
		else{
			for (int i = 0; i < columns.length; i++) {
				columns[i].setData(ViewerColumn.COLUMN_VIEWER_KEY,null);
				
			}
		}
		
	}
	/**