title: MVVM Central App Logic
body: <p>I am using Simple MVVM Toolkit in WPF to create an application, the application uses a central tab control, with a View (UserControl) for each tab item. These Views may also contain tab controls themselves containing further "sub-views". </p>
  
  <p>Our difficulty is in finding a way to share application logic which is used by several of these views, without having one global huge messy class..</p>