Is there any tutorial to teach writing coded UI test by hand without a builder?

Question

Is there any tutorial to teach writing coded UI tests without a builder? The action recorder is good, but the generated codes are too difficult to read anyway and too complicated to me. I tried to launch a AUT (Calculator) by calling ApplicationUndeTest.Launch() method, and then trying to find a button to click. The calculator is actually launched, but the Mouse.Click() alway throw a null reference exception. Here is my codes:

using System;
using System.Text;
using System.Collections.Generic;
using System.Linq;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using Microsoft.VisualStudio.TestTools.UITesting;
using Microsoft.VisualStudio.TestTools.UITest.Extension;

namespace TestProject1 {

	/// <summary>
	/// Summary description for GUITest
	/// </summary>
	[CodedUITest]
	public class GUITest {

		private static string CALCULATOR_PATH = "C:\\Windows\\System32\\calc.exe";
		private static string CALCULATOR_ALTERNATE_PATH = "%SystemRoot%\\System32\\calc.exe";

		private ApplicationUnderTest _application;
		private UITestControl _window;
		private TestContext _context;

		/// <summary>
		/// Gets or sets the test context which provides information about and functionality for the current test run.
		/// </summary>
		public TestContext TestContext {
			get {
				return _context;
			}
			set {
				_context = value;
			}
		}

		/// <summary>
		/// Launch Calculator before each test method
		/// </summary>
		[TestInitialize()]
		public void MyTestInitialize() {
			_application = ApplicationUnderTest.Launch(CALCULATOR_PATH, CALCULATOR_ALTERNATE_PATH);
			_window = new UITestControl(_application);
			_window.TechnologyName = "MSAA";
			_window.SearchConfigurations.Add(SearchConfiguration.VisibleOnly);
			_window.SearchProperties.Add(WinProperties.Window.ControlType, "Window");
			_window.SearchProperties[WinProperties.Window.Name] = "小算盤";
		}
		
		// Use TestCleanup to run code after each test has run
		[TestCleanup()]
		public void MyTestCleanup() {
			if (_application != null) {
				_application.Close();
			}
			Playback.Cleanup();
		}

		[TestMethod]
		public void TestMethod1() {
			ClickButtonByText(_window, "1");
			ClickButtonByText(_window, "2");
			ClickButtonByText(_window, "3");
			ClickButtonByText(_window, "+");
			ClickButtonByText(_window, "3");
			ClickButtonByText(_window, "2");
			ClickButtonByText(_window, "1");
			ClickButtonByText(_window, "=");
		}

		private void ClickButtonByText(UITestControl window, string text) {
			UITestControl control = new UITestControl(window);
			control.TechnologyName = "MSAA";
			control.SearchConfigurations.Add(SearchConfiguration.VisibleOnly);
			control.SearchProperties.Add(WinProperties.Button.ControlType, "Button");
			control.SearchProperties[WinProperties.Button.Name] = text;
			System.Console.WriteLine(control);
			Mouse.Click(control, control.GetClickablePoint());
		}
	}
}

The exception stack trace

Microsoft.VisualStudio.TestTools.UITesting.UITestControl.GetPropertyValue(String propertyName)
Microsoft.VisualStudio.TestTools.UITesting.UITestControl.GetProperty(String propertyName)
Microsoft.VisualStudio.TestTools.UITesting.UITestControl.GetPropertyInternal[T](String propertyName)
Microsoft.VisualStudio.TestTools.UITesting.UITestControl.get_BoundingRectangle()
Microsoft.VisualStudio.TestTools.UITesting.UITestControl.CaptureImage()
Microsoft.VisualStudio.TestTools.UITesting.Playback.CaptureScreenShot(UITestControl control)
Microsoft.VisualStudio.TestTools.UITesting.Playback.GetUITestControlString(UITestControl control)
Microsoft.VisualStudio.TestTools.UITesting.Playback.AddUITestControlDescriptionToException(SystemException exception, IPlaybackContext context)
Microsoft.VisualStudio.TestTools.UITesting.Playback.MapAndThrowException(SystemException exception, IPlaybackContext context)
Microsoft.VisualStudio.TestTools.UITesting.Playback.MapAndThrowException(SystemException exception, String actionName, UITestControl uiControl)
Microsoft.VisualStudio.TestTools.UITesting.Playback.MapAndThrowException(SystemException exception, String actionName, Object parameterValue, UITestControl uiControl)
Microsoft.VisualStudio.TestTools.UITesting.UITestControl.GetPropertyValue(String propertyName)
Microsoft.VisualStudio.TestTools.UITesting.UITestControl.GetProperty(String propertyName)
Microsoft.VisualStudio.TestTools.UITesting.UITestControl.GetPropertyInternal[T](String propertyName)
Microsoft.VisualStudio.TestTools.UITesting.UITestControl.get_BoundingRectangle()
Microsoft.VisualStudio.TestTools.UITesting.UITestControl.GetClickablePoint()
TestProject1.GUITest.ClickButtonByText(UITestControl window, String text) in d:\documents\visual studio 2010\Projects\TestProject1\TestProject1\GUITest.cs: line 76
TestProject1.GUITest.TestMethod1() in d:\documents\visual studio 2010\Projects\TestProject1\TestProject1\GUITest.cs: line 59