Whenever you hit `Next`, the `onSave` callback for...

# tornadofx

[edvin]

Whenever you hit Next, the onSave callback for the current view is triggered. After onSave has run, the Wizard will check if the current page's complete boolean expression returns true (You can trigger it manually by setting isComplete = true/false. By default, all wizard pages are complete, so you don't need to deal with this unless you want to prevent the user from going to the next page until the step is complete.