I apologize it took us so long to get back to you. We're temporarily overloaded in support and trying to catch up as quickly as we can.
The first thing to keep in mind is that all the UI elements you can find in a WPF application derive from the base class FrameworkElement. All of the Find.AllByxxx methods return an IList i.e. an array of objects. You can store them into a generic list of FrameworkElement objects like this:
Dim elements As IList(Of FrameworkElement) = wpfApp.MainWindow.Find.AllByName("UserName")
Or get a single element of any type like this:
Dim userElement As FrameworkElement = wpfApp.MainWindow.Find.ByName("UserName")
I hope this helps.
the Telerik team