Bug 211703 Support muti-view on report item.
As title described.
xtab/org.eclipse.birt.report.item.crosstab.core/src/org/eclipse/birt/report/item/crosstab/core/de/CrosstabReportItemHandle.java
* @return
	 */
	public List getAggregationMeasures( int axisType )
	{
		return new CrosstabReportItemTask( this )
				.getAggregationMeasures( axisType );
	}
	/**
	 * Gets the aggregation function for the row/column grand total in the
	 * crosstab.
	 * 
	 * @param crosstab
	 * @param axisType
	 * @param measureView
	 * @return
	 */
	public String getAggregationFunction( int axisType,
			MeasureViewHandle measureView )
	{
		return new CrosstabReportItemTask( this ).getAggregationFunction(
				axisType, measureView );
	}
	/**
	 * Gets the aggregation function for the row/column grand total in the
	 * crosstab.
	 * 
	 * @param crosstab
	 * @param axisType
	 * @param measureView
	 * @param function