Thank you for writing.
I am not sure what you have meant by original state. For example if you want to clear all items when the Escape key is pressed you can do that by subscribing to the KeyDown event:
sender, KeyEventArgs e)
(e.KeyCode == Keys.Escape)
radAutoCompleteBox1.CaretIndex = 0;
If you have meant something else, please specify your precise goals and I will do my best to provide you with a proper solution.
I hope this helps.
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