Accessing code behind objects

As discussed on
http://forums.microsoft.com/MSDN/Sho...04658&SiteID=1

(this is the XAML:
<Window x:Class="MyCompany.MyProductSpace.MyWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:my="clr-namespace:MyCompany.MyProductSpace"
>

<Window.Resources>
<my:MyConverter x:Key="myConverter" />
</Window.Resources>

This is the code behind:

namespace MyCompany.MyProductSpace
{
[ValueConversion(typeof(String), typeof(String))]
public class MyConverter : IValueConverter
{ ... }
}

And this is the error:

error 4 Assembly '' was not found. The 'clr-namespace' URI refers to an
assembly that is not referenced by the project.)

It seems that custom namespaces makes Cider unusable. Is there any
workaround available?

Thanks,

Jan