Thank you for contacting us.
I am not sure that I understand exactly what you are trying to achieve. If I am right, you want a two-way binding to the SelectedItem in RadListPicker and when you change the bound item, you want the selection in the ListPicker to reflect the change. I have attached a quick sample that demonstrates a way to do this with a converter. Please, take a look at it and confirm that this is what you want to do. If not, please explain in more details, or prepare a sample that recreates your scenario, so I can assist you further.
Please note that you will need to open a new support ticket in order to attach your sample application.
I am looking forward to your response.
All the best,
the Telerik team
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