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/VirtualCrosstabCellFlowLayoutEditPolicy.java
VirtualCrosstabCellAdapter parentAdapter = (VirtualCrosstabCellAdapter)parentObj;
			if (parentAdapter.getType( ) == VirtualCrosstabCellAdapter.IMMACULATE_TYPE
					|| parentAdapter.getType( ) == VirtualCrosstabCellAdapter.MEASURE_TYPE)
			{
				return UnexecutableCommand.INSTANCE;
			}
			if (ICrosstabCellAdapterFactory.CELL_FIRST_LEVEL_HANDLE.equals( childAdapter.getPositionType( )))
			{
				if (!(after instanceof FirstLevelHandleDataItemEditPart) )
				{
					afterObj = null;
				}
				if (parent.getParent( ) == child.getParent( ).getParent( ))
				{
				ChangeAreaCommand command = new ChangeAreaCommand(parentAdapter.getDesignElementHandle( ), 
						childAdapter.getDesignElementHandle( ),(DesignElementHandle) DNDUtil.unwrapToModel( afterObj ) );
				
				command.setType( parentAdapter.getType( ) );
				return command;
				}
				else
				{
					return UnexecutableCommand.INSTANCE;
				}
			}
		}
		return UnexecutableCommand.INSTANCE;
	}
}