Bug 164509 Breaking API change: ColumnViewer#getItemAt(Point)
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/ColumnViewer.java
*/
	public abstract ICellModifier getCellModifier();
	/**
	 * Return the CellEditors for the receiver.
	 * 
	 * @return CellEditor[]
	 * @since 3.1 (in subclasses, added in 3.3 to abstract class)
	 */
	public abstract CellEditor[] getCellEditors();
	/**
	 * Returns the column properties of this table viewer. The properties must
	 * correspond with the columns of the table control. They are used to
	 * identify the column in a cell modifier.
	 * 
	 * @return the list of column properties
	 * @since 3.1 (in subclasses, added in 3.3 to abstract class)
	 */
	public abstract Object[] getColumnProperties();
	/**
	 * Return the TableColumnViewer at columnIndex
	 * 
	 * @param columnIndex
	 * @return TableColumnViewer
	 */
	public ViewerColumn getViewerColumn(final int columnIndex) {
		ViewerColumn viewer;
		Widget columnOwner = getColumnViewerOwner(columnIndex);
		if (columnOwner == null) {
			return null;
		}