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
column.setExpression( ExpressionUtil.createJSMeasureExpression( measureView.getCubeMeasureName( ) ) );
			column.setAggregateFunction( function != null ? function
					: getDefaultMeasureAggregationFunction( measureView ) );
			if ( rowLevel != null )
			{
				column.addAggregateOn( rowLevel );
			}
			if ( colLevel != null )
			{
				column.addAggregateOn( colLevel );
			}
			
			ComputedColumnHandle columnHandle = ( (ReportItemHandle) crosstab.getModelHandle( ) ).addColumnBinding( column,
					false );
			
			DataItemHandle dataItem = crosstab.getModuleHandle( )
					.getElementFactory( )
					.newDataItem( null );
			dataItem.setResultSetColumn( columnHandle.getName( ) );
			cell.addContent( dataItem );
		}
	}
	/**
	 * Generates an meaningful and unique computed column name for a measure
	 * aggregation.
	 * 
	 * @param measureView
	 * @param aggregationOnColumn
	 * @param aggregationOnRow
	 * @return