Bug 313297 XML data set fail in chart data preview
chart/org.eclipse.birt.chart.ui/src/org/eclipse/birt/chart/ui/swt/CustomPreviewTable.java
|| event.keyCode == SWT.ARROW_DOWN )
		{
			newSelectionValue += 1;
		}
		if ( newSelectionValue < widget.getMinimum( ) )
		{
			newSelectionValue = widget.getMinimum( );
		}
		else if ( newSelectionValue > widget.getMaximum( ) )
		{
			newSelectionValue = widget.getMaximum( );
		}
		widget.setSelection( newSelectionValue );
		Event newEvent = new Event( );
		newEvent.widget = widget;
		newEvent.type = SWT.Selection;
		newEvent.data = event.data;
		widget.notifyListeners( SWT.Selection, newEvent );
	}
	/**
	 * Move the selected column to specified index.
	 * 
	 * @param index
	 */
	public void moveTo( int index )
	{
		cnvCells.moveTo( index );
	}
}