Bug 182000 Cross tab layout behavior
In the current approach of cross tab layout view, the arrow is associated with the first data item in the cell. - User cannot delete measure and level data items which have arrow with them. -Wenbin has concerns with the approach, as this will make the UI very restrictive. - Also user may want to delete data item and just show image in a cross tab cell. We had a discussion with Bang, and he has revised the mockups for the layout - The idea is that the arrow is associated with the cross tab cell and not data item. Let us know if there are any issues with supporting this.
xtab/org.eclipse.birt.report.item.crosstab.ui/src/org/eclipse/birt/report/item/crosstab/internal/ui/editors/model/CrosstabHandleAdapter.java
/**
	 * return the previous levelviewhandle
	 * 
	 * @return
	 */
	
	
	private LevelViewHandle getPreviousLevelViewHandle(
			DimensionViewHandle dimensionHandle, LevelViewHandle levelHandle )
	{
		int index = levelHandle.getIndex( );
		if ( index > 0 )
		{
			return dimensionHandle.getLevel( index - 1 );
		}
		else
		{
			int dimIndex = dimensionHandle.getIndex( );
			if ( dimIndex <= 0 )
			{
				return null;
			}
			DimensionViewHandle preDimsionViewHandle = getCrosstabReportItemHandle( )
					.getDimension( dimensionHandle.getAxisType( ), dimIndex - 1 );
			return preDimsionViewHandle.getLevel( preDimsionViewHandle
					.getLevelCount( ) - 1 );
		}
	}
	/**
	 * Use the old model add to model list, so the no new editpart creat