how to automatic solo the Aux track ?

when i solo the audio track in the HD system in my working place, the Aux track will also automatic solo at the same time. but when i work on the LE system at home, it doesnt automatic solo. can anyone tell me how to setup this thing? thank you so much =)

Either command+click or option+click on the Solo button of the aux (it will "dim" the button) I forget which of the two^^ it is, but one of them will do it.

got it~ thank you so much =)