Bug 181061 [Viewers] JFace viewers performance issues in 3.3
A number of the JFace performance tests are red since I20060926-0800.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/ColumnViewer.java
if (row != null) {
			return row.getCell(point);
		}
		return null;
	}
	/**
	 * Returns the viewer row at the given widget-relative coordinates.
	 * 
	 * @param point
	 *            the widget-relative coordinates of the viewer row
	 * @return ViewerRow the row or <code>null</code> if no row is found at
	 *         the given coordinates
	 */
	protected ViewerRow getViewerRow(Point point) {
		Item item = getItemAt(point);
		if (item != null) {
			return getViewerRowFromItem(item);
		}
		return null;
	}
	
		
			
	/**
	 * Returns a {@link ViewerRow} associated with the given row widget. Implementations
	 * may re-use the same instance for different row widgets; callers can only use the viewer
	 * row locally and until the next call to this method. 
	 * 
	 * @param item the row widget
	 * @return ViewerRow a viewer row object