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
DimensionViewHandle dimensionView = (DimensionViewHandle) levelView.getContainer( );
		if ( dimensionView == null )
			return null;
		int index = levelView.getIndex( );
		if ( index - 1 >= 0 )
			return dimensionView.getLevel( index - 1 );
		
		CrosstabViewHandle crosstabView = (CrosstabViewHandle) dimensionView.getContainer( );
		if ( crosstabView == null )
			return null;
		index = dimensionView.getIndex( );
		for ( int i = index - 1; i >= 0; i-- )
		{
			dimensionView = crosstabView.getDimension( i );
			int levelCount = dimensionView.getLevelCount( );
			if ( levelCount > 0 )
				return dimensionView.getLevel( levelCount - 1 );
		}
		return null;
	}
	/**
	 * Gets the innermost level view in the crosstab.
	 * 
	 * @param crosstab
	 * @param axisType
	 * @return
	 */
	public static LevelViewHandle getInnerMostLevel(
			CrosstabReportItemHandle crosstab, int axisType )