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
List rows = buildRowArea( );
		List details = buildMeasures( );
		buildModel( list, columns, rows, details );
		adjustColumn( columns, details );
		adjustRow( rows, details );
		int rowBase = ( (Integer) map.get( COLUMNAREA_ROW ) ).intValue( );
		int columnBase = ( (Integer) map.get( ROWAREA_COLUMN ) ).intValue( );
		CrosstabCellAdapter first = factory.createCrosstabCellAdapter(
				LEFT_CONNER, null, 1, rowBase, 1, columnBase, false );
		list.add( 0, first );
		
		Collections.sort( list, new ModelComparator( ) );
		oldModelList = list;
		return list;
	}
	private void adjustColumn( List columns, List details )
	{
		for ( int i = 0; i < columns.size( ); i++ )
		{
			CrosstabCellAdapter adapter = (CrosstabCellAdapter) columns.get( i );
			int row = adapter.getRowNumber( );
			
			int column = adapter.getColumnNumber( );
			int columnSpan = adapter.getColumnSpan( );
			if ( !adapter.getPositionType( ).equals(
					ICrosstabCellAdapterFactory.CELL_SUB_TOTAL ) )
			{
				continue;
			}
			if ( isBefore( adapter.getCrosstabCellHandle( ) ) )