Unable to Merge Partition

Dear Apple Community,
I am having issues merging the partition on my Macbook Pro.
I created a separate partition of 50GB to install and test OS X Yosemite Beta (Macintosh HD 2).
After playing around with it, I decided to remove the partition created.
Now, I would like to regain the 50GB that I used to partition for Yosemite - note the empty grey space between Macintosh HD and Bootcamp.
From my understanding, I should be able to just drag the bottom corner of the partition lay out in order to regain the 50GB that was set aside.
However, after I click apply, nothing happens and it reverts back to:
I've also tried doing by via the Recovery HD (rebooting and holding down alt) with no success.
Am I doing something wrong? I don't want to do a fresh install
Any help or advice would be greatly appreciated.
Sincerely,
David

Thanks for your clarification, Drew.
When I boot up in recovery mode (cmd+r) I am able to load up disk utility however, I essentially go through the same process as in the first post.
From my understanding, I believe what you have said is completely correct. After attempting to resize the partition, I get prompted with a pop up display that states: "Partition failed. Partition failed with the error. Couldn't unmount disk."
Unfortunately, I don't have any boot up disks. I have only been backing up those important files onto an external HDD. If you don't mind me asking, which of the methods would you advise as being the one most likely to solve this partition issue, and least time consuming? I'm actually not too fussed about reformatting anymore.
Oh yes, I am running 10.9 and not 10.6. I noticed this afterwards but was unable to figure out how to move this thread. Apologies as this was my first time on the forum.
Thanks again.

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