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When opening a modal window, is there any way to changed/customize the effects of the window opening? For example, make the window fade-in at a slow rate or give it an effect like this lightbox example?
Unfortunately there's no such functionality in Vaadin at this time. If you want your windows to behave like that you'll have to extend the functionality of Vaadin's windows. In other words, it's possible, but not currently provided by the framework.