OS X :: Disk Utility Will Not Allow To Resize Partition

Originally I had 2 partitions on the internal 500gb hd in my MBP, one was 455gb the other was 10gb that I used to mess around on. I do not remember what format the small partition was in last, it may have been FAT32. I wanted to delete the small partition and consolidate into one partition. My OSX partition is formatted macos extended. I went to Disk Utility and deleted the small partition by selecting it and clicking "-." There was grey space where the partition used to be. No problems here. Most of the options in Disk Utility are greyed-out.

I cannot select a different partition scheme. When I try to resize the partition either by dragging it to cover the grey space or by manually typing in a larger size, there is no way to apply the changes. The "Apply" button is continually greyed-out (See Image). If I try to resize the partition and then close the window, Disk Utility alerts me that I have an operation in progress and that unsaved changes will be lost. Disk Utility is not letting me resize my main OSX Partition, it appears that I do not have appropriate permissions to make this change - I am the only user/admin of this machine.