Can't delete a permission from within VC...Why?

[getatme]

I would like to modify the permissions within VC and delete a Active Directory group from having rights to an ESX server. However, when I right click the group the delete and properties options are greyed out. I'm sure it's pretty simple but for some odd reason, I'm overlooking the obvious.

Need help.

See screen print

[virtualdud3]

With what account are you logged-in to the VirtualCenter?

Are you trying to remove the permission while logged-in as an Administrator?

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[getatme]

No, I'm logged in with my Active Directory credentials.

[Rajeev_S]

what permission does ur domain ID has?