Bug 240363 [Viewers] [open type] Problem with Open Type filtering
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTableViewer.java
*/
	protected abstract void doShowItem(Item item);
	/**
	 * Deselects all selected items in the receiver.
	 *
	 * @since 3.3
	 */
	protected abstract void doDeselectAll();
	/**
	 * Sets the receiver's selection to be the given array of items. The current
	 * selection is cleared before the new items are selected.
	 * <p>
	 * Items that are not in the receiver are ignored. If the receiver is
	 * single-select and multiple items are specified, then all items are
	 * ignored.
	 * </p>
	 *
	 * @param items
	 *            the array of items
	 *
	 * @exception IllegalArgumentException -
	 *                if the array of items is null
	 *
	 * @since 3.3
	 */
	protected abstract void doSetSelection(Item[] items);
	/**
	 * Shows the selection. If the selection is already showing in the receiver,
	 * this method simply returns. Otherwise, the items are scrolled until the
	 * selection is visible.