CrossUITesting-CreateXamlWindow.cs

private XamlWindow _window;

public string AppId { get; set; }

internal IApp StartApp()
{
    try
    {
      _window = XamlWindow.Launch(AppId);
      return this;
    }
    catch (UITestControlNotFoundException)
    {
        Console.WriteLine(
            "The Test Framework could not get a handle on the application. " +
            "Try re-running the tests.");
        throw;
    }
  }