Custom command button with dynamic Id = ""

[Stefan]

How do i set a custom command button with dynamic id="2012-12-1 23:23"?
I was trying:

columns.Command(command => command.Custom("Avboka").Click("confirmBookingRemoval").HtmlAttributes(new { @Id =  Model.First().StartDate.ToString() }));

But the model is null when i tries to use it.