Cleaned up wpf sample with some view models.

Tests/Tester.WPF/CapVM.cs

@@ -0,0 +1,33 @@
+using NTwain.Values;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Tester.WPF
+{
+    /// <summary>
+    /// Wraps a capability as a view model.
+    /// </summary>
+    class CapVM
+    {
+        public CapabilityId Cap { get; set; }
+
+        public string Name
+        {
+            get
+            {
+                if (Cap > CapabilityId.CustomBase)
+                {
+                    return "[Custom] " + ((int)Cap - (int)CapabilityId.CustomBase);
+                }
+                return Cap.ToString();
+            }
+        }
+
+        public override string ToString()
+        {
+            return Name;
+        }
+    }
+}