Hiding/Showing Links in Telerik MVC2 Grid

Question

I have a Telerik MVC2 Grid which has a column like:

columns.Bound(c => c.CustomerID)
       .Format(Html.ActionLink("Close", "CloseCustomer", new { Id = "{0}"}).ToString())
       .Encoded(false)
       .Title(String.Empty)
       .Width(80);

the objects being used also include a closed flag, and I'd like to be able to get it to make the link invisible if the customer is already closed (the object being used also has a ClosedFlag as well as CustomerID).

Is there a simple way to do this, or do I have to use custom templates?