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
for (int column = 0; column < columnCount || column == 0; column++) {
				ViewerColumn columnViewer = getColumnViewer(column);
				columnViewer.refresh( getRowPartFromItem(item),column);
				
				
				if (item.isDisposed()) {
					unmapElement(element, item);
					return;
				}
			}
		}
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.jface.viewers.ColumnViewer#getColumnViewerOwner(int)
	 */
	protected Widget getColumnViewerOwner(int columnIndex) {
		if( columnIndex < 0 || columnIndex > getTable().getColumnCount() ) {
			return null;
		}
		
		if (getTable().getColumnCount() == 0)
			return getTable();
		
		
		return getTable().getColumn(columnIndex);
	}