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/editpolicies/CrosstabCellContainerEditPolicy.java
{
			Object model = ( (EditPart) parts.get( i ) ).getModel( );
			Object parent = ( (EditPart) parts.get( i ) ).getParent( )
					.getModel( );
			if ( parent instanceof CrosstabCellAdapter )
			{
				if ( ICrosstabCellAdapterFactory.CELL_FIRST_LEVEL_HANDLE.equals( ( (CrosstabCellAdapter) parent ).getPositionType( ) )
						|| ICrosstabCellAdapterFactory.CELL_MEASURE.equals( ( (CrosstabCellAdapter) parent ).getPositionType( ) ) )
				{
					if (model == ((CrosstabCellAdapter)parent).getFirstDataItem( ))
					{
						if (size == 1)
						{
							return new Command( ) {
							};
						}
						else
						{
							return UnexecutableCommand.INSTANCE;
						}
					}
					
				}
			}
			result.add( new DeleteCommand( model ) );
		}
		return result.unwrap( );
	}
}