title: Enable Button when row selected in DataGrid using Expression Blend?
body: <p>As titled, I want to enable the a Button (that was disabled) when a row from DataGrid (so an object) is selected.</p>
  
  <p>From what I read, WPF seems to have triggers for check when centain property change it can do centain thing?</p>
  
  <p>But in Silverlight it seems I can only use GoToState instead.  I tried to make two states: Selected and UnSelected.  But the IsEnabled property for the Button it doesn't seems being record from UnSelected state to Selected state...</p>
  
  <p>And another problem is the only event that fits from DataGrid is SelectionChanged, but how do I ensure that the User does selected a Row?</p>
  
  <p>If I do everything in code-behide I can check SelectionChangedEvent and enable the buttons, but is there anyway to do everything above with Expression Blend?  I am trying to put everything in xaml as much as possible.</p>
  
  <p>Thanks</p>