Xceed.Wpf.ListBox (nuget): Combines the streamlined form factor of a listbox—as well as unique “path” views—with lightning-fast remote data retrieval and absolute responsiveness.  You can try this package for free for 45 days, after which you will need to purchase a license key to continue using it.
Keywords: Xceed|Toolkit|Plus|for|WPF|ultimate|listbox