Find silverlight element using XamlPath

In order to find Silverlight element using WebAii by XamlPath expression I used following syntax

FrameworkElement myElement = app.Find.ByExpression(new XamlFindExpression("Name=TabsContainer", "XamlTag=grid", "|", "XamlPath=/radtabcontrol[automationid=Tabs]/grid[0]/raddockpanel[0]/layouttransformcontrol[name=HeaderDockedElement]/grid[name=RootVisual]/contentpresenter[name=ContentPresenter]/grid[0]/raddockpanel[0]/scrollviewer[automationid=ScrollViewerElement]/border[0]/grid[0]/scrollcontentpresenter[name=ScrollContentPresenter]/itemspresenter[0]/tabwrappanel[0]/radtabitem[0]"));