It would be helpful to be able to include a style library with a form or view. This would be simpler than modifying and maintaining a theme's CSS files. This feature would be greatly aided by the addition of a custom class property to objects. So that all controls in the designer would have a new property "Custom Class" which would be injected into the class attribute as specified and would allow the targeted application of CSS to elements. Even just the Custom Class property would go a long way.