BorderClipConverter don't showing

[PedroBizachi]

Hello!

I'm trying to use BorderClipConverter, but this tool aren't showing when i call him through 'xmlns:wpf="clr-namespace:MaterialDesignThemes.Wpf;assembly=MaterialDesignThemes.Wpf"' and calling by '<materialDesign:BorderClipConverter x:Key="BorderConverter"/>' inside the ResourceDicionary. What am i doing wrong?

Context:
I'm making a template for a button in my project that is similar to the FlatButton of MaterialDesign, using the "Expansive" effect when the user clicks on the button. But i only acomplished it using the CardClipConverter (That is obsolete).