title: WPF Dynamic DataTemplate: GridView CellTemplate is not null but VisualTree property is null
body: <p>I am trying to set the DataTemplate of my ListView.GridView's CellTemplate dynamically at runtime.
  The problem is when I do this, nothing happens. I checked the CellTemplate and it's not null but its VisualTree property is null. 
  Any suggestions? </p>
  
  <pre><code>GridViewColumn gvc = new GridViewColumn
      {
          Header = col.Label ?? col.Name,
          DisplayMemberBinding = binding                        
      };
  
  DataTemplate cellTemplate = FindDataTemplate(listView, col.CellTemplate);
  if (cellTemplate != null)
      gvc.CellTemplate = cellTemplate;
  
  gridView.Columns.Add(gvc);
  </code></pre>