What I can suggest you in order to achieve this particular scenario, would be to hook to the MouseLeftButtonDown
event of the AutoCompleteBox. Inside of the handler you would be able to manually focus the control and in addition to this you can select the text inside by getting the WatermarkTextBox from the ControlTemplate of the AutoCompleteBox. Please check the following code snippet:
sender, MouseButtonEventArgs e)
var autoCompleteBox = sender
var txtBox = autoCompleteBox.ChildrenOfType<RadWatermarkTextBox>().First();
Hope this helps.
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