title: DataGrid that also supports a tree view
body: <p>Do you know of any datagrid-like control that also supports a treeview. Like this (but still fully WPF-stylable/templatable):</p>
  
  <p><strong>Update</strong>: UI-virtualization would be another important feature.</p>
  
  <p><img src="https://i.stack.imgur.com/SE1YO.jpg" alt="enter image description here"></p>