Watin Internet Explorer how to start in-private mode?

I am writing a few automated web tests using C# Watin framework.

I was hoping anyone can help me out,

How do i open new IE instance in "in private" browse mode? (i.e incognito mode)

The need for "in private" browsing, is because some of the tests, require log in. (and i run a few in parallel)

I could not find any resources on the matter. (other than half patch i found in some forum)

Thanks for your help!

Solution

The only solution i was able to find, is to open IE instance via command in incognito mode, then attach Watin to it.

    //gen random url so we can find the window later
    Random rnd = new Random();
    int id = rnd.Next(1000, 10000); 
    string url = "id" + id+".com";
    //opening explorer
    Process.Start("IExplore.exe", "-private -nomerge " + url);
    browser = Browser.AttachTo<IE>(Find.ByUrl(new Regex(url)));
    browser.GoTo("http://www.google.com");