Why can't I set boot to 10.10 when I'm booted to 10.6.8?

ok, I have a multi-boot set up, I have 10.6.8 and 10.10 installed on a pair of HD's, After the debacle of installing yosemite, Why Can't I see the install when I'm booted to my tried and true 10.6.8 system (in Sys Pref/startupdisk/)? Only way I can get to it is restarting and selecting "option". thoughts? thanks.
and I like going back and forth due to Working apps, new's nice but sometimes lately some things don't work right. Better to learn, experiment and try the new stuff, but Work and rely on stuff that actually functions. That's why I skipped 10.7, 10.8 and 10.9.

So boot to Yosemite, open Startup Disk, select your Yosemite disk as the startup disk. Then use OPTION booting to boot into Snow Leopard. Or you can do this in reverse. Depends on which one you want as the permanent startup disk.

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