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/ColumnViewer.java
* @return the {@link Item} at the coordinates or <code>null</code> if
	 *         there is no item at the given coordinates
	 */
	protected abstract Item getItemAt(Point point);
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.viewers.StructuredViewer#getItem(int, int)
	 */
	protected Item getItem(int x, int y) {
		return getItemAt(getControl().toControl(x, y));
	}
	/**
	 * The column viewer implementation of this <code>Viewer</code> framework
	 * method ensures that the given label provider is an instance of
	 * <code>ITableLabelProvider</code>, <code>ILabelProvider</code>, or
	 * <code>CellLabelProvider</code>.
	 * <p>
	 * If the label provider is an {@link ITableLabelProvider}, then it
	 * provides a separate label text and image for each column. Implementers of
	 * <code>ITableLabelProvider</code> may also implement
	 * {@link ITableColorProvider} and/or {@link ITableFontProvider} to provide
	 * colors and/or fonts.
	 * </p>
	 * <p>
	 * If the label provider is an <code>ILabelProvider</code>, then it
	 * provides only the label text and image for the first column, and any
	 * remaining columns are blank. Implementers of <code>ILabelProvider</code>
	 * may also implement {@link IColorProvider} and/or {@link IFontProvider} to
	 * provide colors and/or fonts.