Cleaned up wpf sample with some view models.

Tests/Tester.WPF/DSVM.cs

@@ -0,0 +1,20 @@
+using NTwain.Data;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Tester.WPF
+{
+    /// <summary>
+    /// Wraps a data source as view model.
+    /// </summary>
+    class DSVM
+    {
+        public TWIdentity DS { get; set; }
+
+        public string Name { get { return DS.ProductName; } }
+        public string Version { get { return DS.Version.Info; } }
+        public string Protocol { get { return string.Format("{0}.{1}", DS.ProtocolMajor, DS.ProtocolMinor); } }
+    }
+}