Bug 210716 Support switch Text/Chart view in crosstab cell
Need crosstab UI provide support to switch between Text and Chart view in measure/aggregation cell.
xtab/org.eclipse.birt.report.item.crosstab.core/src/org/eclipse/birt/report/item/crosstab/core/de/internal/CrosstabModelUtil.java
* @param functions
	 * @param isAdd
	 *            true if add aggregation, otherwise false
	 * @throws SemanticException
	 */
	public static void addMeasureAggregations(
			CrosstabReportItemHandle crosstab, String leftDimension,
			String leftLevel, int axisType, String rightDimension,
			String rightLevel, List measures, List functions )
			throws SemanticException
	{
		if ( crosstab == null
				|| !isValidAxisType( axisType )
				|| measures == null )
			return;
		if ( functions == null || functions.size( ) != measures.size( ) )
			return;
		String rowDimension = null;
		String rowLevel = null;
		String colDimension = null;
		String colLevel = null;
		if ( axisType == ROW_AXIS_TYPE )
		{
			rowDimension = leftDimension;
			rowLevel = leftLevel;
			colDimension = rightDimension;
			colLevel = rightLevel;
		}
		else if ( axisType == COLUMN_AXIS_TYPE )
		{