It finds the first specified type of control in calling method, and return it;

gistfile1.cs

 public static T FindFirstSelectControlInControl_ExtentionMethod<T>(UITestControl ControlInWhichSelectControlCanBeFound)
        {
            T element = default(T);
            var childrenControl = ControlInWhichSelectControlCanBeFound.GetChildren();
            if (childrenControl.Count > 0)
            {
                childrenControl.All(x =>
                {
                    if (x is T)
                    {
                        element = (T)Convert.ChangeType(x, typeof(T));
                        return false;
                    }
                    else
                    {
                        element = FindFirstSelectControlInControl_ExtentionMethod<T>(x);
                        if (element != null) return false;
                        return true;
                    }
                });

            }
            return element;
        }