Bug 255229 [Viewers] [3.5] NPE in ColumnViewerToolTipSupport
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/ViewerRow.java
* Constant denoting the row below the current one (value is 2).
	 * 
	 * @see #getNeighbor(int, boolean)
	 */
	public static final int BELOW = 2;
	
	private static final String KEY_TEXT_LAYOUT = Policy.JFACE + "styled_label_key_"; 
	/**
	 * Get the bounds of the entry at the columnIndex,
	 * 
	 * @param columnIndex
	 * @return {@link Rectangle}
	 */
	public abstract Rectangle getBounds(int columnIndex);
	/**
	 * Return the bounds for the whole item.
	 * 
	 * @return {@link Rectangle}
	 */
	public abstract Rectangle getBounds();
	/**
	 * Return the item for the receiver.
	 * 
	 * @return {@link Widget}
	 */
	public abstract Widget getItem();
	/**
	 * Return the number of columns for the receiver.
	 * 
	 * @return the number of columns