As discussed at: http://vaadin.com/forum/-/message_boards/message/159198 This is at a very early stage. The example in the add-on makes a Password Dialog look very much like it would on a Windows system. The Title Bar has the Windows blue coloring The window background has Windows grey coloring The buttons change shade when the cursor moves over them The Red X at the top right changes shade when the cursor moves over it The Minimize and Maximize buttons have not been implemented yet For someone who wants a Password Dialog with the labels to the left of the textfields (something it is currently hard to do in Vaadin), that part of the Add-On, independent of the theme, may be useful.