Broken examples

[magi42]

Many of the examples are broken because of various reasons.

• [advanced.windows.tab](http://demo.vaadin.com/book-examples-vaadin7/book/#advanced.windows.tab advanced.windows.tab)
• advanced.windows.closing
• advanced.windows.automatic

This is an overall ticket for various miscellaneous issues. Separate tickets of specific fixes may be created, especially if major.