GP files: playing all instruments together?

I'm new to MuseScore, which i'm trying out mostly because i've banged my head against the wall a couple times too many while trying to get TuxGuitar to sound good in Linux. Trying out a nightly build of MuseScore seems to work better - except for one thing i can't seem to figure out.

Apologies if this has been covered before, i didn't find an answer. When i open a .gp5 file, i get the separate instruments laid out in their own tabs. If i want to see the guitar tabs, i choose that tab, but doing so only plays the guitar instrument and mutes the others. How can i follow the guitar tab *and* have all the other instruments play at the same time as well? If this is not currently possible, is it a planned feature?

Thanks in advance.