Two way binding to a global 'boolean' in XAML?

There's quite a lot out there regarding binding a XAML StaticResource, such as a string constant to a XAML control. However I cannot find a good way to do two way binding in this scenario.

I want to bind a global boolean to a checkbox which enables 'debugging' mode, that toggles visibility of certain things throughout my application.

I thought I could solve the problem with the following resource defined in Resources.xaml. This basically wraps any object with a dependency object that can be bound to:

<local:BindingWrapper x:Key="DebugMode">
    <local:BindingWrapper.Value>
        <sys:Boolean>false</sys:Boolean>
    </local:BindingWrapper.Value>
</local:BindingWrapper>

where BindingWrapper is an instance of this class :

public class BindingWrapper : DependencyObject
{
    public object Value
    {
        get { return (object)GetValue(ValProperty); }
        set { SetValue(ValProperty, value); }
    }

    public static readonly DependencyProperty ValProperty =
        DependencyProperty.Register("Value", typeof(object), typeof(BindingWrapper), null);
}

Then throughout my application I can just use the following :

Visibility="{Binding Source={StaticResource DebugMode},Path=Value,
            Converter={StaticResource booleanToVisibilityConverter}}"

And I DID solve the problem with this. It works great EXCEPT in the designer, where I end up with the dreaded Element-is-already-the-child-of-another-element error. In both VS2010 and Blend 4 I get this error and cannot edit the control.

SO... whats a good way to achieve TWO WAY binding of a primitive constant in an application resource.

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Two way binding to a global 'boolean' in XAML?

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