how to generate bus signal to a2l ?

Hi, now matlab2010b support the bus data type, so I define a signal to the predefined bus type,and the code generated is OK, but the simulink.signal with bus type can not be generated in the a2l file. How can I to achieve that ? Thank you! by the way ,I also want to know whether the matlab2010b Service pack1 is include in the matlab2010b service pack2? Thank you!