in a view I display a form with many controls
if a user change values in one or more controls, and the user try to exit without saving . I want to show a message asking if he want to save before exit
is a way to identify, if in any control, user changes values (without compare manually, in each control, initial vs actual value)
I am using vaadin 7 ( BeanItemContainer and fieldgroups )
thanks for any help
Fidel Lagos