Assembly references syntax highlight

Hi,

I'm trying to get the syntax highlight to work but it only highlights all common names.

editor.Language = new CSharpSyntaxLanguage();
var Project = editor.Language.CSharpSyntaxLanguage.GetService<IProjectAssembly>();

editor.Language.RegisterProjectAssembly(Project);

Project.AssemblyReferences.AddMsCorLib();
Project.AssemblyReferences.AddFrom("C:\\test.dll");

 The test.dll assembly contains a class called 'TestClass'.

If I now paste the following code in the editor, TestClass does not get highlighted.

class Test
{
	var test = new TestClass(); //no syntaxhighlight
	test.write(this.Column); //'this.' is highlighted
}

 What am I missing?