I thought the latest razor version was supposed to allow getting nodes and their children by doc type?

e.g (doc type names)

Home
> SlideShow
>> Slide
>> Slide

With this:

foreach(var item in Model.SlideShow.Slides){
  @item.Name
 }

I get this error:

Error loading Razor Script 
'umbraco.MacroEngines.DynamicNodeList' does not contain a definition for 'Slides'