Readonly nodes with ObservableDictionary

Hello, I have ObservableDictionary assigned to ItemsSource property of PropertyGrid. How can I make some nodes in grid as read only?

At the moment, the only way to do this is to specify PropertyEditors (with the template identified by the PropertyGrid.ReadOnlyDisplayKey) for each entry you want to make read-only.  If this set is static, you can do this in the XAML; if you have to figure out which entries are read-only at runtime, say as you are loading the dictionary entries from your data source, then you can do it in code.  This will look something like:

foreach (Entry entry in myDataSource)
{
  dictionary[newEntry.Name] = newEntry.Value;
  if (newEntry.IsReadOnly)
  {
    PropertyEditor editor = new PropertyEditor();
    editor.EditorTemplate = (DataTemplate)(grid.FindResource(PropertyGrid.ReadOnlyDisplayKey));
    editor.PropertyName = newEntry.Name;
    grid.Editors.Add(editor);
  }
}

Just to follow up on this, in the runtime case, another approach is described at http://www.mindscape.co.nz/blog/index.php/2008/04/30/smart-editor-declarations-in-the-wpf-property-grid/. 

It works fine, thanks