Reorged source tree.

samples/Sample.WPF/ViewModels/DataSourceVM.cs

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+using GalaSoft.MvvmLight;
+using NTwain;
+using NTwain.Data;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.ComponentModel;
+using System.Linq;
+using System.Windows.Data;
+
+namespace Sample.WPF
+{
+    /// <summary>
+    /// Wraps a data source as view model.
+    /// </summary>
+    class DataSourceVM : ViewModelBase
+    {
+        public DataSource DS { get; set; }
+
+        public string Name { get { return DS.Name; } }
+        public string Version { get { return DS.Version.Info; } }
+        public string Protocol { get { return DS.ProtocolVersion.ToString(); } }
+
+        ICollectionView _capView;
+        public DataSourceVM()
+        {
+            Caps = new ObservableCollection<CapVM>();
+            _capView = CollectionViewSource.GetDefaultView(Caps);
+            _capView.SortDescriptions.Add(new System.ComponentModel.SortDescription("Name", System.ComponentModel.ListSortDirection.Ascending));
+            _capView.Filter = FilterCapRoutine;
+        }
+
+        private bool FilterCapRoutine(object obj)
+        {
+            if (!string.IsNullOrWhiteSpace(CapFilter))
+            {
+                var vm = obj as CapVM;
+                if (vm != null)
+                {
+                    return vm.Name.IndexOf(CapFilter, System.StringComparison.OrdinalIgnoreCase) > -1;
+                }
+            }
+            return true;
+        }
+
+        public void Open()
+        {
+            Caps.Clear();
+            var rc = DS.Open();
+            //rc = DGControl.Status.Get(dsId, ref stat);
+            if (rc == ReturnCode.Success)
+            {
+                foreach (var c in DS.Capabilities.CapSupportedCaps.GetValues().Select(o => new CapVM(DS, o)))
+                {
+                    Caps.Add(c);
+                }
+            }
+        }
+
+        private string _capFilter;
+
+        public string CapFilter
+        {
+            get { return _capFilter; }
+            set
+            {
+                _capFilter = value;
+                _capView.Refresh();
+            }
+        }
+
+        public ObservableCollection<CapVM> Caps { get; private set; }
+    }
+}