volume grp configuration issue with dynamic volume

In Configuration - > Volume group menu:
I found there is a dynamic volume created with 960G in use, all functions are gray out.
I can't remove this dynamic volume at all.
Does any one know how to remove it pls? This new box is bought from Silicon M. licensed with 24TB. It is configured with 20TB RAID5 using 3ware RAID controller.
Thanks!
Steve:

Go to the Console screen and enter CTRL + ALT + X for the Extended tools function then select the last option "Delete contents of Units" then select the Dynamic unit. Please be careful and make sure you are selecting the correct unit as you can lose all data if you select the incorrect choice.