Thank you for your interest in RadListBox control.
I couldn't reproduce the behavior that you are experiencing in your application. I have created sample project based on the provided code snippet to test your scenario. You can find the project attached to this reply. When you run the project you can observe that the binding is working as expected. Give this project a try and let me know if I am missing something in order to reproduce this behavior. Also, when you run your application you can double check in the output tab of VS for binding errors.
In addition, you can check the SelectedItemsSource help article
in our documentation which describes how you can manipulate the SelectedItems
collection in a case when you have multiple selected items.
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