I have recently created a partition on my macbook air running OS X 10.9, and this was to run Yosemite (OS X 10.10) on it. I got the partition running fine, with the OS working fine as well, but now when I go back into Disk Utility, I noticed two things that are wrong:
Firstly, the disk that houses the two partitions now is called "Yosemite" (the name of the new partition), instead of what it originally said, somewhere along the lines of "125GB Hard Drive" or similar.  Due to this, I believe, the tabs have changed when I select this disk, and I can no longer resize the partitions. The options are greyed out, and I cannot drag to resize either. 
The Disk Utility looks similar to that seen in this question: http://apple.stackexchange.com/questions/84424/unable-to-adjust-partition-of-usb-drive-with-mountain-lion-disk-utility though my computer is not encrypted, and it is the computer, not the USB I am having trouble with.

I tried entering Disk Utility from the Recovery Mode (by holding down option at start up), but the problem still persists.
I have tried changing the start up discs between the two, but still nothing changed in the menu. 

I believe that a reason for this problem is that somehow the drive is now a logical volume group. I don't really understand what this is, and how to fix it.

Also, I do not believe this question to be off topic due to the involvement of a pre-release software, as the installation of Yosemite did not seem to affect the problem, rather it was the partitioning.

Here is an image of my Disk Utility: ![Screenshot of Disk Utility][1]

Any help would be appreciated,
Thanks,
Cory


  [1]: https://i.sstatic.net/aelcS.jpg