Bug 153993 [Viewers] Common Baseclass for Tree/TableEditorImpl
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/ColumnViewer.java
* 
	 * @param point
	 *            the point in the viewer where you need to corresponding cell
	 *            from
	 * @return the cell or if no cell is found at this point
	 */
	ViewerCell getCell(Point point) {
		ViewerRow row = getViewerRow(point);
		if (row != null) {
			return row.getCell(point);
		}
		return null;
	}
	/**
	 * Get the ViewerRow at point.
	 * 
	 * @param point
	 *            the point <b>relative to the display</b> you are interested
	 *            in
	 * @return ViewerRow the row or <code>null</code>if no row is found at
	 *         this point
	 */
	protected ViewerRow getViewerRow(Point point) {
		Item item = getItemAt(point);
		if (item != null) {
			return getViewerRowFromItem(item);
		}
		return null;
	}
	/**