OS X Mavericks not showing up in boot menu?

Hi,
I recently applied to the OS X Yosemite Beta program and downloaded and installed the Beta. I have a 1TB Hard drive in my MacBook Pro which is was partitioned in two partitions, one for OS X Mavericks and one for Bootcamp. I decided I wanted to keep my original partitions intact so I installed the Yosemite beta onto an external hard drive so I wouldn't affect my main system. The Yosemite Beta installed and booted fine from the external hard drive but when I rebooted my computer I was presented with option to boot into my Bootcamp partition or an OS X Yosemite Installer. I can boot into Windows fine but not OS X Mavericks. The OS X Mavericks partition is still intact but does not show up during start up. I tried using a third-party bootloader like rEFIt but doesn't seem to work. Any help would be greatly appreciated.
Here is an image showing my boot menu, the items in orange are my external hard drive with the Yosemite Beta on it.

Thanks for the reply, I managed to solve my problem by forcibly unmounting the install partition and booting into Bootcamp (My only option). From there I selected my OS X Mavericks partition from the Bootcamp menu in Windows and I rebooted successfully into it. For some reason it still wont show up in the boot menu but rEFIt now works and will detect it along with the Bootcamp partition

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