Given the following code,

Choices choices = new Choices();
choices.Add(new GrammarBuilder(new SemanticResultValue("product", "<product/>")));

GrammarBuilder builder = new GrammarBuilder();
builder.Append(new SemanticResultKey("options", choices.ToGrammarBuilder()));

Grammar grammar = new Grammar(builder) { Name = Constants.GrammarNameLanguage};
grammar.Priority = priority;

_recognition.LoadGrammar(grammar);

How can I add additional words to the loaded grammar? I know this can be achieved both in native code and using the SpeechLib interop, but I prefer to use the managed library.

Update: What I want to achieve, is not having to load an entire grammar repeatedly because of individual changes. For small grammars I got good results by calling

_recognition.RequestRecognizerUpdate()

and then doing the unload of the old grammar and loading of a rebuilt grammar in the event:

void Recognition_RecognizerUpdateReached(object sender, RecognizerUpdateReachedEventArgs e)

For large grammars this becomes too expensive.