Add IntelliPrompt from DLL path

I'm trying to programmable add intellisense from a DLL. 

I did find something In the documentation that may work.

Under: "Activpro Syntax Editor > LL(*) Parser Framework > .NET Languages Add-on > C# Language > Getting Started"

var language = new CSharpSyntaxLanguage();
var project = language.GetService<IProjectAssembly>();
var assemblyLoader = new BackgroundWorker();
assemblyLoader.DoWork += (sender, e) => {
    project.AssemblyReferences.AddMsCorLib();  // MsCorLib should always be added at a minimum
    project.AssemblyReferences.Add("System");
    project.AssemblyReferences.AddFrom(@"C:\MyAssembly.dll");
    project.SourceFiles.QueueFile(language, @"C:\MyFile.cs");
};
assemblyLoader.RunWorkerAsync();

However, the method project.AssemblyReferences.AddFrom() doesn’t seem to exists.

Thanks