添加项目文件。

Szmedi.RvKits/RvScript/ActiveDocumentConverter.cs

@@ -0,0 +1,30 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Data;
+
+namespace Szmedi.RvKits.RvScript
+{
+    class ActiveDocumentConverter : IValueConverter
+
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is DocumentViewModel)
+                return value;
+
+            return Binding.DoNothing;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is DocumentViewModel)
+                return value;
+
+            return Binding.DoNothing;
+        }
+    }
+}