Bug 189363 The aggregation of table should be start with sigma symbol
Description: Follow the spec, after specify a aggregation on a table, the aggregation should be represented by starting with the sigma symbol
xtab/org.eclipse.birt.report.item.crosstab.ui/src/org/eclipse/birt/report/item/crosstab/internal/ui/editors/action/AddSubTotalAction.java
setImageDescriptor( ImageDescriptor.createFromImage( image ) );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.action.Action#run()
	 */
	public void run( )
	{
		transStar( NAME );
		try
		{
			AggregationDialog dialog = new AggregationDialog( UIUtil.getDefaultShell( ) );
			List subTotals = getSubTotalInfo( );
			List grandTotoals = getGrandTotalInfo( );
			dialog.setInput( copySubTotal( subTotals ),
					copyGrandTotal( grandTotoals ) );
			if ( dialog.open( ) == Window.OK )
			{
				Object[] result = (Object[]) dialog.getResult( );
				processSubTotal( subTotals, (List) result[0] );
				processGrandTotal( grandTotoals, (List) result[1] );
			}
		}
		catch ( SemanticException e )
		{
			rollBack( );
			ExceptionHandler.handle( e );
			return;
		}