Disk Partition Problem

I have OS X Lion and a Bootcamp partition, I had the other day resized the OS X partition to create a shared partition. Now, I no longer need the newly created partition, so i deleted and wanted to merge with the OS X partition but nothing seems to happen when I drag ( bottom right corner).

I also went to Lion Recovery and Disk Utitilty, but no luck. As far as I understand, it may not allow to expand, as OS X cannot be mounted but why allow resizing and not extending.

Here is the screenshot of my partitions. Thanks for the help.

 

Thanks will check it out...or may end up formatting OS X partition and reinstalling lion.