Bug 164509 Breaking API change: ColumnViewer#getItemAt(Point)
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/ColumnViewer.java
/**
	 * Create a ViewerColumn for the columnOwner.
	 * 
	 * @param columnOwner
	 * @param labelProvider
	 * @return ViewerColumn
	 */
	protected ViewerColumn createColumnViewer(Widget columnOwner,
			CellLabelProvider labelProvider) {
		return new ViewerColumn(columnOwner, labelProvider);
	}
	/**
	 * Activate the tooltip support.
	 */
	public void activateCustomTooltips() {
		if (tooltipSupport == null) {
			tooltipSupport = new ToolTipSupport(this);
		} else {
			tooltipSupport.activate();
		}
	}
	/**
	 * Deactivate the tooltip support.
	 */
	public void deactivateCustomTooltips() {
		if (tooltipSupport != null) {
			tooltipSupport.deactivate();
		}
	}
	/**