Generic Behavior

Question

I would like create generic behavior. My problem is generic declaration in XAML.

    public class GenericBehavior<T> : Behavior<DataGrid>
        where T : class 
    {
    }

I can’t use x:TypeArguments because I don’t have loose XAML file.

In WPF and when targeting .NET Framework 4, you can use XAML 2009 features together with x:TypeArguments but only for loose XAML (XAML that is not markup-compiled). Markup-compiled XAML for WPF and the BAML form of XAML do not currently support the XAML 2009 keywords and features

I found some workaround with MarkupExtension but with Behaviors not work.

In my current solution I attach behavior in code.

Any idea?