Sorry for this misunderstanding. Unfortunately, setting the focus to the TextBox is not as easy as I thought .
I would suggest you to add an Id (or Index) property of your ViewModel. Also, you could add an attached property to the textbox and bind it to the SelectedIndex of the RadCoverFlow. Then, you could check whether the Id is equal to the SelectedIndex or not, in order to set focus to the textbox.
Attached you can find the sample. I hope this helps. Please do not hesitate to contact us if you require any further information.
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