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
/**
	 * Set the TableColumnViewerPart at columnIndex to be viewerPart.
	 * 
	 * @param viewerPart
	 * @param columnIndex
	 */
	public void setColumnPart(ViewerColumn viewerPart, int columnIndex) {
		TableColumn column = getTable().getColumn(columnIndex);
		column.setData(ViewerColumn.COLUMN_VIEWER_KEY, viewerPart);
	}
	/**
	 * Starts editing the given element.
	 * 
	 * @param element
	 *            the element
	 * @param column
	 *            the column number
	 */
	public void editElement(Object element, int column) {
		tableViewerImpl.editElement(element, column);
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.viewers.ColumnViewer#getCellEditors()
	 */
	public CellEditor[] getCellEditors() {
		return tableViewerImpl.getCellEditors();
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.jface.viewers.ColumnViewer#getCellModifier()