Have you ever tried to add/remove/change style sheets of Vaadin components dynamically, without css file modification? We didn't find suitable methods in Vaadin' standard components.

We miss methods like

in Vaadin. It's very easy to change style sheets with css files that are included in your project(s), but if you need a little bit more control... or must create dynamic applications - it's not possible out-of-the-box.

I'm not sure why there are no such methods, because GWT has all of them?

But no worries, with Vaadin 7 it's easy to add support for CSS manipulation. Simply use UI Extensions.

You'll find our CssExtension in our Vaadin UI project.