I am trying to sort a calculated column in an telerik grid, following this example in the demos.
Even though the sort expression says last name, the column is being sorted on the first name.

How can i actually sort on last name?
<
telerik:GridCalculatedColumn
UniqueName
=
"Name"
SortExpression
=
"LastName"
HeaderText
=
"Calculated Column"
DataFields
=
"FirstName, LastName"
Expression
=
'{0} + " " + {1}'
FooterText
=
"CalculatedColumn footer"
>
</
telerik:GridCalculatedColumn
>
Even though the sort expression says last name, the column is being sorted on the first name.
How can i actually sort on last name?