Bug 209128 BIRT Cross tab Model Change - Support for filter on measures
TO support filter condition on cross tab measure, Model changes are needed to support filter condition list on cross tab report item.
xtab/org.eclipse.birt.report.item.crosstab.core/src/org/eclipse/birt/report/item/crosstab/core/de/MeasureViewHandle.java
DesignElementHandle element = getAggregationsProperty( ).getContent(
				index );
		return (AggregationCellHandle) CrosstabUtil.getReportItem( element,
				AGGREGATION_CELL_EXTENSION_NAME );
	}
	/**
	 * Removes aggregation cell at the given position. The position index is
	 * 0-based integer.
	 * 
	 * @param index
	 *            the position index of the aggregation cell to remove
	 * @throws SemanticException
	 */
	public void removeAggregation( int index ) throws SemanticException
	{
		getAggregationsProperty( ).drop( index );
	}
	/**
	 * Gets the position index where this measure lies in the crosstab
	 * container. The returned value is a 0-based integer if this level is in
	 * the design tree. Otherwise return -1.
	 * 
	 * @return position index if found, otherwise -1
	 */
	public int getIndex( )
	{
		return handle.getIndex( );
	}
	/**
	 * Gets measure header cell for specific dimension and level.