XamlObjectWriter fails with bindings?

Hi All.
I'm Trying to load the following basic xaml with XamlObjectWriter (.Net 4) (source code included)
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:sys="clr-namespace:System;assembly=mscorlib"
        Title="MainWindow" Height="350" Width="525" x:Name="mainWindow">
 
       
       
   

 
 
 The code is quite simple:
            XmlReader xr = XmlReader.Create("../../XAMLSimpl.xaml");
            XamlXmlReader reader = new XamlXmlReader(xr);
            XamlObjectWriter writer = new XamlObjectWriter(reader.SchemaContext);
            while (reader.Read())
            {
                writer.WriteNode(reader);
            }
            object res = writer.Result;
 When I run the the code I get the following exception (because the binding)
{"A 'Binding' cannot be set on the 'Content' property of type 'Button'. A 'Binding' can only be set on a DependencyProperty of a DependencyObject."}
A 'Binding' cannot be set on the 'Content' property of type 'Button'. A 'Binding' can only be set on a DependencyProperty of a DependencyObject.
 
If I try to use the old style code:
FileStream reader = new FileStream("../../XAMLSimpl.xaml", FileMode.Open);
object res = System.Windows.Markup.XamlReader.Load(reader);
 
Everything works fine.

Any suggestion?
 
Many thanks in advance,
 
Edu.