Disk utility doesn't allow partitioning of internal HD

After having succesfully installed a Win7 partition with bootcamp I've now got 2 partitions,
the Macintosh HD aund the Bootcamp partition.
I'd now like to split my Macintosh HD partition (to get one separate for data only).
However, in the disk utility this option is not selctable:
+ an - are greyed out,
Partition Layout dropdpown menu is greyed out,
Name format and size are greyed out.
(Everything works fine on the mac and also the Volume & Rights checks by the disk utility were all o.k.)
What is the reason for this behaviour and what can I do in order to split in two partitions?
Your help appreciated, thanks.

You should of taken the encryption off before you started that proccess. That is one thing they don't tell you. Never try to modify an encrypted partition.
You may have to boot to the Internet (Online) Recovery HD system lto Re-Partition the drive as one partition.
Hold down Command+Option+r keys at boot and keep them held down until you see a spinning globe in the center of the screen, then you can let them up. Have the computer WIRED to your unternet router.
Once that loads open disk utility and select the Drive Name (Not volume name, IE Macintosh HD) and then the partition tab and select One partition from the Partition Layout drop down.
If that doesn't work then the drive is FUBAR.

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    You may have to boot to the Internet (Online) Recovery HD system lto Re-Partition the drive as one partition.
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