You can set the current date of the control by setting the DisplayDate of the Calendar located inside of the Template of the DatePicker. What you can do is to hook to the KeyUp event of the DatePicker, in the handler you can find the Calendar in the Template and set its DisplayDate property as desired whenever the F3 button is clicked. Please check the following code snippet and let me know if it helps as I'm not complete sure if this was the exact requirement:
sender, KeyEventArgs e)
(e.Key == Key.F3)
var calendar =
DateTime(2015, 1, 1);
Hope this will work for you.
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