添加项目文件。

Fluent.Ribbon/Fluent.Ribbon.Tests/Helper/ReflectionHelper.cs

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+namespace Fluent.Tests.Helper
+{
+    using System;
+    using System.Reflection;
+
+    public static class ReflectionHelper
+    {
+        public static T GetFieldValue<T>(this object obj, string fieldName)
+        {
+            return (T)GetPrivateFieldInfo(obj.GetType(), fieldName).GetValue(obj);
+        }
+
+        private static FieldInfo GetPrivateFieldInfo(Type type, string fieldName)
+        {
+            return type.GetField(fieldName, BindingFlags.Instance | BindingFlags.NonPublic);
+        }
+    }
+}

Fluent.Ribbon/Fluent.Ribbon.Tests/Helper/UIHelper.cs

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+namespace Fluent.Tests.Helper
+{
+    using System;
+    using System.Windows.Threading;
+
+    public static class UIHelper
+    {
+        public static void DoEvents()
+        {
+            Dispatcher.CurrentDispatcher.DoEvents();
+        }
+
+        public static void DoEvents(this Dispatcher dispatcher)
+        {
+            dispatcher.Invoke(DispatcherPriority.Background, new Action(() => { }));
+        }
+    }
+}