title: how to call a window's Loaded event in WPF MVVM?
body: <p>It is easy enough to create a command from my OnLoaded() event
  handler code, but how do I call it from the View?</p>
  
  <p><b>&lt;window Loaded="onLoaded"&gt;</b> doesn't cut the cake anymore since
  it calls code in the xaml.cs. How would I create an ICommand 
  equivalent?</p>