FPM and work protect

Question

Hi,
I am modifying the ESS SP10's Leave application.
I am curious as to how FPM relates to Work Protect mode.
When I test out the application it is able to detect unsaved data, but where is the code that does this check? I have read about Work Protect Mode (http://tinyurl.com/2cbfk2) but when i searched the codes i could not find any references to the WDPortalWorkProtectMode class. 
Does FPM call this class?
If FPM calls this class on my behalf, the question is how FPM knows I have unsaved data?
Does the isDirty method have anything to do with this?

Answer 1

Thanks for the link.
But does it work the same if my application uses the FPM framework and not just WD?
I thought that FPM should call the WDPortalWorkProtectMode class on my behalf, as I do not see any codes inside the standard ESS leave application that calls the WDPortalWorkProtectMode class directly. Yet when i try to navigate away from the ESS Leave Request page, it correctly warned me about unsaved data.
I am very curious how FPM accomplish this feat, in the hope that I can do the same as well.