title: Caliburn Micro, set focus from MV
body: <p>How to bind UI element (like textBox) focus to view model?</p>
  
  <p>I have Windows Phone app with pivot control. Based on active pivot item I want to set focus to certain text box. Also when user inserts text to text box and hit enter, I want to set focus somewhere else than the text box to close virtual keyboard. </p>
  
  <p>How to do this with Caliburn Micro, view model?</p>