title: How to bind KeyUp/down to a button Click event?
body: <p>Suppose I have usercontrol with textbox, combobox, button,... inside this control.</p>
  
  <p>Button1 is bound to a ICommand in view model.</p>
  
  <p>My request is: when user hit Enter key in any field, like any textbox, combobox, it will fire Button1 Click event, so that ICommand will be called.</p>
  
  <p>How to implement this?</p>