How to Resize Macintosh HD in Disk Utility

Hello everyone,
I am currently running OSX Mountain Lion, but at the time of this problem, I was just running OSX Lion.
I had recently installed Windows 7 to a Bootcamp Parition that was made via the Apple Bootcamp application. It was a success, all went well, and everything is fine in that regard.
However, at some point along the line, I figured that I was going to run out of room on my Windows partition, so I decided, foolishly, that I would make the Macintosh HD partition smaller and then just simply make the Windows partition bigger.
As I'm sure you all know, that was the wrong thing to do, and now I would just like to have my Macintosh HD partition take back its' unallocated space.
Unfortunately, It will not let me resize the Macintosh HD back to its' original size, and I am dumbfounded. I've tried many times but to no avail. It will let me drag the Macintosh HD slider down into the unallocated space, let me press the apply button, then it says "Partition Complete". But it is left exactly the same as it was.
Any help would be greatly appreciated. The unallocated space measures up too about 125 gb...... which I kind of want back
Thanks in advance!

Hi I realize this is an old thread but I thought I might chime in with my workaround.  I did what you did, and resized my windows partition to include 50 more gigabytes using partition wizard.  Later I decided to give it back to macintosh and when trying to reclaim the unallocated space with the disk utility it simply snapped back to where it was before.  After digging around I decided to mess with it because I really did not want to delete my windows partition.  I tried just repartitioning 49 of the 50gb and it worked.  I still have about 1gb that is unallocated but for me it is a much better solution than to reinstall windows.
OSX Mavericks 10.9.3
MBPr late 2012 model

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