Problem with keep_context. Possible solution lifetime_page

Hello all!!

I have a problem with the keep_context attribut of one of my bsp's taht makes that the data of a tableview go duplicated in different acces.

Can i use the attribute lifetime_page to control taht every time the user exit the page all the data is erased form the memory. Anybody has an example how to use it?

Thanks i advance and sorry for my poor english

Miquel