Startup choices not showing up after install of earlier system on second drive

I run Yosemite on my main hard drive and love it. However, I have Pro Tools 10 and it won't run on the latest OSX 10.10.2 (Yosemite). So I decided to install OSX 10.6.8 on one of 5 internal hard drives on my computer so I could use PT10. So the install was successful, but when I go to my startup disk to select my Yosemite drive to startup with it again, I get no choice to select it. The only choice I get in my Startup Disk selections is the 10.6.8 drive, and the 10.6.8 install disk which is in my DVD drive. All my other drives are visible when I have a window open in 10.6.8, including the Yosemite, but not visible in as a startup choice in the Startup Disk preference.
The fact I see everything still in a window keeps me from freaking out.
Can someone tell me how to make my other system drive visible as a choice? I don't know what I've done to make it not visible. I've done this kind of thing plenty of times over the years, using another drive for an earlier system, but this has never happened where the others don't show up as a choice to restart, and I'm a tad  worried.
Thanks for your help!
Michael

Niel,
Thanks so much for responding. It solved my problem! All is well.
Two more questions, if you don't mind.
1) Do I have to do that every time I want to get back to my Yosemite drive from 10.6.8? Can I change that where it shows up all the time?
2) What do I do to have all the other drive icons show up on the desktop of the 10.6.8 drive? Even the main 10.6.8 drive isn't showing on the desktop. I remember this happening before, but forgot what I did to correct it.
Again, many thanks!!!!

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