Commented Issue: MessageBox v2.0 borderbrush can't be disabled [19951]

In the version 2.0, I try to modify the messageBox style by removing border. If you set BorderBrush value to x:Null, border isn't disabled.
Comments: ** Comment from web user: emartin **

Indeed, the BorderBrush and the BorderThickness are no longer "TemplatedBinded" in the ControlTemplate.
The border to bind to is named "ContentBorder" in file WindowContainer.xaml ...