[Solved] Select command on grid returns wrong URL

[Sune]

Hi I have a presumably simple problem but I need some help.
I have a grid on a page with the URL:

http://localhost:52637/SessionPlanner/SessionPlanner/Edit/16

This grid lets you select a client by clicking the select command button.
However, when clicking the select button the url returned is:

http://localhost:52637/SessionPlanner/SessionPlanner/Edit/a363ea56-44b4-4989-860d-bdfad93d3bbc?EnrolledClients-mode=select

When it should be something like:

http://localhost:52637/SessionPlanner/SessionPlanner/Edit/16?EnrolledClients-mode=select&clientId=a363ea56-44b4-4989-860d-bdfad93d3bbc

How do I fix this?