As far as your first question is concerned, you may take a look at the following forum thread
, which provides a solution for such a scenario.
As far as your second question is concerned, I am afraid that filtering a RadTreeView is a scenario not supported out of the box. You may test the project from the following forum thread
and check if it is applicable for your scenario. I hope that these guidelines would help you to achieve the desired functionality.
Do you need help with upgrading your ASP.NET AJAX, WPF or WinForms projects? Check the Telerik API Analyzer
and share your thoughts.