ImageButton compatible with Xamarin.Forms 1.3.0.6292

Hi,

Is the ImageButton that is detailed here (https://github.com/XLabs/Xamarin-Forms-Labs/wiki/ImageButton) compatible with Xamarin.Forms 1.3.0.6292.

When I try and use it I get the following exception :-

System.TypeInitializationException: An exception was thrown by the type initializer for Xamarin.Forms.Labs.Controls.ImageButton

Thanks

Paul Diston