title: Binding PropertyName of CollectionViewSource SortDescription in Xaml
body: <p>Here is my xaml that tells the collectionviewsource sort property name.</p>
  
  <pre><code>&lt;CollectionViewSource Source="{Binding Contacts}" x:Key="contactsCollection" Filter="CollectionViewSource_Filter"&gt;
              &lt;CollectionViewSource.SortDescriptions&gt;
                  &lt;scm:SortDescription PropertyName="DisplayName" /&gt;
              &lt;/CollectionViewSource.SortDescriptions&gt;
  &lt;/CollectionViewSource&gt;
  </code></pre>
  
  <p>The xaml above works fine but problem I have is that I don't know how to give a variable value to SortDescription PropertyName. I have a property in my viewmodel that tells which property to sort on but I am not able to bind this property to SortDescription's PropertyName field.</p>
  
  <p>Is there any way?</p>