I am attempting to extend visual studio functionality by adding support
for a language I frequently need to use.

I am trying to setup outlining (collapsible regions) for code written
in the editor. I have set AutoOutlining to true. The VS SDK documents
say that this should then cause VS to automatically call ParseSource
and provide the AuthoringSink for my code to then fill with the hidden
(collapsible) regions. My problem is that ParseSource is never being
called.

Have I misunderstood what to do? Or am I just missing something? It
appears the *only* time I can get ParseSource to fire, is when I right
click some of the code in the editor, and chose "goto definition", it
then correctly calls ParseSource with "Goto" as the reason. This is the
only time it seems to fire. It is not being automatically called when
the document loads as the SDK documentation suggests.

Any help would be appreciated.
Andy Savage.

Related sections of code follow:

public override LanguagePreferences GetLanguagePreferences()
       {
           LanguagePreferences preferences = new
LanguagePreferences(this.Site, typeof(ASLanguageService).GUID,
this.Name);
           preferences.Init();
           preferences.AutoOutlining = true;
           // <.. Other preferences cut from here to make this
snippet shorter ...>

           return preferences;
       }

public override AuthoringScope ParseSource(ParseRequest req)
       {
           Debug.WriteLine(String.Format("ParseSource at ({0}:{1}),
reason {2}", req.Line, req.Col, req.Reason));

            // <... code to generate and walk AST here ommited in
snippet ...>

           // Always Need To Return A Valid Authoring Scope
           return new ASAuthoringScope();
       }