Add project files.

UI/WPF/Converters/ValueConverterGroup.cs

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+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Windows.Data;
+
+namespace TheXamlGuy.UI.WPF
+{
+    public class ValueConverterGroup : List<IValueConverter>, IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return this.Aggregate(value,
+                (current, converter) => converter.Convert(current, targetType, parameter, culture));
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}