Scott, I did think about doing that but it becomes a nightmare to manage when you are using it for lots of different buttons all over the site that do different things. I think I am going to have to hold off until Daniel does some magic 
I believe you could always generate your own CSS classes with the HandlSpecialURL request method. You can use the execute javascript method to add the class to the control as well. Just a thought…
Yeah that would be a way but for something so simple it feels like a lot of glue and sticky tape to make it work in Xojo, hopefully in a future release they will allow us to be able to create client side events where we can embed JS.