Have you tried using the Telerik.VisualStudio.TestTools.UITest.Extension.ExtensionsCore assembly along with your test project? It is located under "C:\Program Files (x86)\Telerik\UI for WPF Q2 2014\Binaries\WPF40\TestTools\VS2012
". Also copy the DLL to "C:\Program Files (x86)\Common Files\Microsoft Shared\VSTT\11.0
" in case you are using VS 2012.
More information about the UI Automation support can be found here
Hope this helps.
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