title: how to implement control events in wpf using MVVM?
body: <p>I have a slider control in view i need to call the <code>ValueChanged</code> event of slider and update one property in model based on that. how i can implement this using MVVM pattern. 
  where I have to write the <code>ValueChanged</code> event? how i can connect <code>ValueChanged</code> event code with view?</p>