Index: Core/Components/src/Core.Components.GraphSharp.Forms/Converters/PointedTreeVertexTypeToStringConverter.cs
===================================================================
diff -u -r7824b1299ee61690e6bbbb5e665c80e516813653 -r06a0d36d0077dc66466da3296e9ce33f9fa949f2
--- Core/Components/src/Core.Components.GraphSharp.Forms/Converters/PointedTreeVertexTypeToStringConverter.cs	(.../PointedTreeVertexTypeToStringConverter.cs)	(revision 7824b1299ee61690e6bbbb5e665c80e516813653)
+++ Core/Components/src/Core.Components.GraphSharp.Forms/Converters/PointedTreeVertexTypeToStringConverter.cs	(.../PointedTreeVertexTypeToStringConverter.cs)	(revision 06a0d36d0077dc66466da3296e9ce33f9fa949f2)
@@ -30,6 +30,7 @@
     /// <summary>
     /// Converter to change a <see cref="PointedTreeVertexType"/> instance to a string.
     /// </summary>
+    [ValueConversion(typeof(PointedTreeVertexType), typeof(string))]
     public class PointedTreeVertexTypeToStringConverter : IValueConverter
     {
         public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
@@ -54,7 +55,7 @@
 
         public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
         {
-            throw new NotImplementedException();
+            throw new NotSupportedException();
         }
     }
 }
Index: Core/Components/test/Core.Components.GraphSharp.Forms.Test/Converters/PointedTreeVertexTypeToStringConverterTest.cs
===================================================================
diff -u -r7824b1299ee61690e6bbbb5e665c80e516813653 -r06a0d36d0077dc66466da3296e9ce33f9fa949f2
--- Core/Components/test/Core.Components.GraphSharp.Forms.Test/Converters/PointedTreeVertexTypeToStringConverterTest.cs	(.../PointedTreeVertexTypeToStringConverterTest.cs)	(revision 7824b1299ee61690e6bbbb5e665c80e516813653)
+++ Core/Components/test/Core.Components.GraphSharp.Forms.Test/Converters/PointedTreeVertexTypeToStringConverterTest.cs	(.../PointedTreeVertexTypeToStringConverterTest.cs)	(revision 06a0d36d0077dc66466da3296e9ce33f9fa949f2)
@@ -87,7 +87,7 @@
         }
 
         [Test]
-        public void ConvertBack_ThrowNotImplementedException()
+        public void ConvertBack_ThrowNotSupportedException()
         {
             // Setup
             var converter = new PointedTreeVertexTypeToStringConverter();
@@ -96,7 +96,7 @@
             TestDelegate call = () => converter.ConvertBack(string.Empty, typeof(PointedTreeVertexType), null, CultureInfo.InvariantCulture);
 
             // Assert
-            Assert.Throws<NotImplementedException>(call);
+            Assert.Throws<NotSupportedException>(call);
         }
     }
 }
\ No newline at end of file