Rounded corner text field with Rebol 2 / Rebol 3?

A tiny detail that is hugely important开发者_JAVA技巧 in today's design is rounded corner field especially for Mobile style. How to do this in Rebol 2, is there any more facilities to do so in Rebol 3 ?

Not specifically in R2, but it's straightforward to apply a bitmap with rounded corners and the ever useful 'extend effect.

You btn instead of button. See http://rebol2.blogspot.it/2012/07/all-vid-styles.html for more details.