Thank you for your patience.
RadAutoCompleteBox doesn't support selecting the selected items and clear them using the delete key. But you can achieve such behavior by subscribing to the PreviewKeyDown event and set the SelectedItems collection of the RadAutoCompleteBox to null.
I have created sample project which demonstrates one way which you can use to achieve such behavior. I have also added a visual notification of the items when you pressed CTRL+A
key combination. I think this project is a good starting point for achieving your final behavior. You can additionally modify the project so it covers all your cases in your main application.
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