Sorting on subobjects in TemplateColumn

[Trevor]

I have a RadGrid populated by an ICollection of objects ("Contacts").  Each contact contains several sub-objects, such as a Customer, Person, etc.  The RadGrid displays, among other things, properties of these sub-objects (Customer.Name, Person.FullName, etc.) in TemplateColumns, but for some reason setting the SortExpression to the sub-object's property leads to the following ASP.NET error:
    "Cannot find column Person.FullName."

Is there a way (other than making Person.FullName a direct property of the main object) to sort on properties of sub-objects?  Am I just missing it?  And if not, why not?

Thanks in advance.

[Shinu]

Hi Trevor,

I found a forum link discussing a similar error. Go through it and see if it helps.
Sorting with custom collection

Shinu.