EF4 - Get Child Value

i'm beginning with EF4,

In my Controller class, i have an object like this

House
   ->List<Wall>
           ->List<Windows>

Because i want to be able to cancel change, i keep this data in a object

(i use SaveChange to "commit" data)

I would like to have a function like that :'Windows getWindowsById(Guid IdWindows)'

Is their any better way to get my windows without iterating with "wall" and "windows" (fore开发者_如何学JAVAach ...) ?

I use CTP5 so maybe a query with the Local propertie can be a way, but i would like to know the best way

thanks

If you are using CTP5 I expect that this should work:

context.Windows.Local.SingleOrDefault(w => w.Id == idWindow);