I don't think it's realistic to declaratively define a UI that works well under both a 15 inch screen and a 2 inch screen. One is probably going to have to prog

I don't think it's realistic to declaratively define a UI that works well under both a 15 inch screen and a 2 inch screen. One is probably going to have to programmatically take different courses of action under each of those scenarios. For example, for mobile you'll probably want to split actions into multiple screens that are best done in a single screen with a big monitor.