I am creating a Fiddler extension in which users will have the ability to filter the sessions in the session list. Based on the user's filter condition I want to show/hide/highlight the sessions in the Fiddler's session list. But the problem that I am facing right now is that oSession["-hide"] = true.ToString().ToLower(); does not make that session hidden. Also now I am not sure how can I highlight that session in the session list.