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
*/
	public CrosstabCellHandle getCell( )
	{
		PropertyHandle propHandle = getDetailProperty( );
		return propHandle.getContentCount( ) == 0
				? null
				: (CrosstabCellHandle) CrosstabUtil.getReportItem( propHandle
						.getContent( 0 ), CROSSTAB_CELL_EXTENSION_NAME );
	}
	/**
	 * Adds an aggregation cell with the specific row/column dimension and
	 * level.
	 * 
	 * @param rowDimension
	 *            qualified name of the row dimension
	 * @param rowLevel
	 *            qualified name of the row level
	 * @param colDimension
	 *            qualified name of the column dimension
	 * @param colLevel
	 *            qualifed name of the column level
	 * @return the added aggregation cell if succeed, otherwise null
	 * @throws SemanticException
	 */
	public AggregationCellHandle addAggregation( String rowDimension,
			String rowLevel, String colDimension, String colLevel )
			throws SemanticException
	{
		AggregationCellHandle aggregation = getAggregationCell( rowDimension,
				rowLevel, colDimension, colLevel );