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
rowLevel = rowLevelHandle.getCubeLevelName( );
				}
				if ( isMeasureHorizontal )
				{
					
					for ( int i = 0; i < crosstabItem.getMeasureCount( ); i++ )
					{
						CrosstabCellHandle aggCell = crosstabItem.getMeasure( i )
								.getAggregationCell( rowDimension,
										rowLevel,
										null,
										null );
						if ( aggCell != null )
						{
							return aggCell;
						}
					}
				}
				else
				{
					
					return crosstabItem.getMeasure( 0 )
							.getAggregationCell( rowDimension,
									rowLevel,
									null,
									null );
				}
			}
			else if ( cell.getContainer( ) instanceof CrosstabReportItemHandle )
			{