Actually, the questions you have raised are reasonable as most of the functionalities are logged in our internal system so we can add them to the current implementation of the control.
1. I have logged the behavior as a bug in our internal system - AutoComplete: Explicitly calling Focus does not show the keyboard
2. We have a feature request already logged regarding this - AutoComplete: Modify Watermark element properties separately
. I have added your report to the item so that its priority is increased. I suggest you follow the item in order to subscribe for further notifications.
3. I am not very sure of the functionality you are aiming at, as with the current implementation typing the specific symbol would cause the ItemsSource collection to be filtered and only the items matching the criteria will be present. Can you please elaborate on your scenario so we can consider a possible approach that fits your specific requirement?
4. Again, we have the functionality logged as a feature request at our and you can follow it in our Ideas & Feedback portal - AutoComplete: Expose property to easily customize the "No Results Found" message
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and vote to affect the priority of the items