Hi all,



I am working on a form with an interface look similar to the SF Localization & Messaging Editor, with a TreeView on the left and a Panel Manager on the right side.



Problem I have is how would I know when a page is being deactivated?





Where do I put code to validate above scenario and avoid Page B from being activated until the conflict have been resolved in Page A?



The same thing is done in the Localization & Messaging Editor, if I am modifying a message then click on another node while the BO is dirty a broken rule is created and I cannot leave that page until I save or cancel the record. In which event should I put the code to validate this condition?



Thanks!

Edhy Rijo