title: Multiple ListBox/Collection Items Selected for MVVM
body: <p>I have a listbox that is bound to an ObservableCollection of Names. Some of the items in the list will have a checkbox that is toggled on/off, indicating the item has been selected.</p>
  
  <p>How do I create an ObservableCollection from the selected items of the first listbox following the Master-Details concept?</p>
  
  <p>(I plan to use my MasterViewModel as the DataContext for my DetailsView which displays the selected items Collection.)</p>
  
  <p>Thanks in advance!</p>