DataGridTextColumn Visibility Binding

Question

I\'m trying to bind column visibility to that of another element like this:

Answer 1

The solution from Johan Larsson works perfectly, only the FallbackValue from the Binding isn't forwarded, so I've changed it like this:

private object DefaultValue(IServiceProvider serviceProvider)
{
    if (Binding.FallbackValue != null)
        return Binding.FallbackValue;

    var provideValueTarget = (IProvideValueTarget)serviceProvider.GetService(typeof(IProvideValueTarget));
    if (provideValueTarget == null)
    {
        throw new ArgumentException("provideValueTarget == null");
    }
    var dependencyProperty = (DependencyProperty)provideValueTarget.TargetProperty;
    return dependencyProperty.DefaultMetadata.DefaultValue;
}

So it could be used like this, here for example for Binding to a Header: