title: Access objects that haven't been created via Blend
body: <p>I'm using Blend for the first time, for a WPF C# project.  I have an expander object that I'm creating on a button press, like below.</p>
  
  <pre><code>var name = selectedItem.Name;
  var expander = new Expander {Header = name};
  </code></pre>
  
  <p>As you can see, I set the expander header by grabbing it from the selected item that creates the actual expander.  </p>
  
  <p>My question is that when I open this project in blend, I can't see the expander because it's not created yet.  How do I set a default background color for each new expander created?  </p>
  
  <p>I'd also be glad to do it via the code itself instead of blend.</p>
  
  <p>Thanks!</p>