You can find the Telerik.WebAii.Controls.Xaml.dll assembly reference in this folder C:\Program Files\Telerik\Testing Framework 2011.1\Bin\Translators.
Check our documentation, section "Silverlight/WPF Test Automation" here
for more information about wrappers. You can also find a sample
available in our CodeLibrary section.
I hope this info helps!
the Telerik team
for a live 'What's New in Test Studio R1 2011 SP2' event on Tuesday, July 19 at 2pm EST!
Have you looked at the new Online User Guide
for Telerik Test Studio?