添加项目文件。

Fluent.Ribbon/Fluent.Ribbon.Showcase/Converters/BackgroundImageViewportConverter.cs

@@ -0,0 +1,24 @@
+namespace FluentTest.Converters
+{
+    using System;
+    using System.Globalization;
+    using System.Windows;
+    using System.Windows.Data;
+
+    public class BackgroundImageViewportConverter : IValueConverter
+    {
+        #region IValueConverter Members
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return new Rect(0, 0, (double)value, 46);
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+
+        #endregion
+    }
+}