Sorting Datagrid with custom datasource

Question

Hi, I have a datagrid that binds to a custom datasource. As such, I could not implement sorting based on the sorting expression. Is there any work arounds? I've read some forums and a suggestion was to implement IBinding for the custom list. Is there any good website that have any examples on these as I am not very sure what are the specific methods that I need to override as I have a whole list of methods to implement when I implement the interface. Thank you.