Bug 160700 [Viewers] Editing backwards compatility
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/ColumnViewer.java
/**
	 * Get the ViewerRow at point.
	 * 
	 * @param point
	 * @return ViewerRow
	 */
	protected ViewerRow getRowPart(Point point) {
		Item item = getItem(point.x, point.y);
		if (item != null) {
			return getRowPartFromItem(item);
		}
		return null;
	}
	protected ViewerRow getRowPartFromItem(Widget item) {
		return (ViewerRow) item.getData(ViewerRow.ROWPART_KEY);
	}
	/**
	 * Get the widget for the column at columnIndex.
	 * 
	 * @param columnIndex
	 * @return Widget
	 */
	protected abstract Widget getColumnViewerOwner(int columnIndex);
	/**
	 * Returns the cell modifier of this viewer.
	 * 
	 * @return the cell modifier
	 * @since 3.1 (in subclasses, added in 3.3 to abstract class)
	 */
	public abstract ICellModifier getCellModifier();