Projektdateien hinzufügen.

VideoBrowser/Helpers/BindingProxy.cs

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+namespace VideoBrowser.Helpers
+{
+    using System.Windows;
+
+    /// <summary>
+    /// Defines the <see cref="BindingProxy" />.
+    /// </summary>
+    public class BindingProxy : Freezable
+    {
+        #region Fields
+
+        /// <summary>
+        /// The binding data context property.
+        /// </summary>
+        public static readonly DependencyProperty DataProperty =
+            DependencyProperty.Register(nameof(DataContext), typeof(object), typeof(BindingProxy), new UIPropertyMetadata(null));
+
+        #endregion Fields
+
+        #region Properties
+
+        /// <summary>
+        /// Gets or sets the DataContext.
+        /// </summary>
+        public object DataContext
+        {
+            get { return GetValue(DataProperty); }
+            set { SetValue(DataProperty, value); }
+        }
+
+        #endregion Properties
+
+        #region Methods
+
+        /// <summary>
+        /// The CreateInstanceCore.
+        /// </summary>
+        /// <returns>The <see cref="Freezable"/>.</returns>
+        protected override Freezable CreateInstanceCore()
+        {
+            return new BindingProxy();
+        }
+
+        #endregion Methods
+    }
+}