I tried to extend my grid with custom columns.
This looks good - but it does not sort for that column.
You can check this out using your own example at http://demos.telerik.com/aspnet-ajax/fileexplorer/examples/customgridcolumns/defaultcs.aspx
It first looks like it does something - BUT - all "Creation Date" and "Owner" have the same value (not so good to proof sorting).
Anyhow - if you simply change the owner by adding an iteration between Telerik and Adam - you will see that sorting this column,
always sorts by name.
So I guess
a.) Something is missing in the sample
b.) There is problem with custom column sorting
c.) I've overseen something (I don't hope so - I tried a lot)