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VS 2012 Casting problem with extended principal class

I have the following piece of code. It's fired when a user double-clicks a Listview entry that could be either a user or a group.

If it's a user it calls GetUserInfo which receives my ExtendedUserPrincipal class (an extension of UserPrincipal)

If it's a group it calls GetGroupInfo which receives the standard GroupPrincipal class.

The call to GetUserInfo fails with a "Unable to cast Principal to ExtendedUserPrincipal" error.

Obviously I'm not casting it correctly so what is the best approach to ensure that the principal returned from the FindByIdentity method can be passed to the GetUserInfo sub as ExtendedUserPrincipal?

Code:

                Dim GroupOrUserObject As Principal = Principal.FindByIdentity(Me.AllEEASObjectsPrincipalContext, IdentityType.Name, GroupOrUserName)

                Select Case GroupOrUserObject.StructuralObjectClass.ToUpper
                    Case "USER"
                        Lv = Me.UserList
                        Me.GetUserInfo(DirectCast(GroupOrUserObject, ExtendedUserPrincipal))

                    Case "GROUP"
                        Lv = Me.GroupsList
                        Me.GetGroupInfo(DirectCast(GroupOrUserObject, GroupPrincipal))
                    Case Else
                        Return
                End Select


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