Bug 174701 [Viewers] ViewerRow should be reused instead of connected to the Item
Currently we create a ViewerRow ver every Item we create this can degrade performance, we should cache the row and reuse it
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/ViewerRow.java
if (column >= 0)
			return new ViewerCell(this, column);
		return null;
	}
	/**
	 * Get the Control for the receiver.
	 * 
	 * @return {@link Control}
	 */
	public abstract Control getControl();
	/**
	 * Returns a neighboring row, or <code>null</code> if no neighbor exists
	 * in the given direction. If <code>sameLevel</code> is <code>true</code>,
	 * only sibling rows (under the same parent) will be considered.
	 * 
	 * @param direction
	 *            the direction {@link #BELOW} or {@link #ABOVE}
	 * 
	 * @param sameLevel
	 *            if <code>true</code>, search only within sibling rows
	 * @return the row above/below, or <code>null</code> if not found
	 */
	public abstract ViewerRow getNeighbor(int direction, boolean sameLevel);
	/**
	 * The tree path used to identify an element by the unique path
	 * @return the path
	 */
	public abstract TreePath getTreePath();
}