resharper search with pattern for using(... new System.Data.Linq.DataContext)

I am attempting to search for

using (var context = new $DataContext$())

where DataContext is any class that extends System.Data.Linq.DataContext using Resharpers 'Search with Pattern'.

The pattern I'm using is:

using($ty开发者_StackOverflow社区pe$ $var$ = new $type$($args$))
{
  $stmt$
}

This appears to return all using statements, eg using StreamWriter, using FileStream, things that clearly do not derive from System.Data.Linq.DataContext

How can you return only the types indicated?

I am using VS 2010 SP1 Beta and ReSharper 5.1 C# Edition build 5.1.1727.12

I suggest you file it as a bug, because the following returns the expected results:

$type$ $var$ = new $type$($args$);

(Settings like you showed them).
It returns only this line:

var context2 = new DataContext("");

But not this:

var stream2 = new FileStream("", FileMode.CreateNew);