There is no viewstate in the MVC world, so HTML helpers, Kendo UI widgets and their server wrappers do not have built-in state persistence. If you require such a functionality, you need to implement it with custom code -
1. Use the PanelBar's client events
to store information about the items' state in some hidden fields.
2. Submit the data to the server via a form or Ajax request.
3. Handle the submitted data in the controller and use it in the View to determine and set the PanelBar items' state.
All the best,
the Telerik team
Join us on our journey to create the world's most complete HTML 5 UI Framework - download Kendo UI