[Trinidad] how to reset a message area after PPR

[Renzo Tomaselli]

Hi, I noticed that PPR does not reset any h:messages contents located on 
a page.
E.g., full page refreshing resets this message - provided that there are 
no news - while PPR (table paging or tree expansion) leaves message 
contents according to last page refresh.
How do I cleanup the message (or even display another one in case PPR 
operation fails) ?

-- Renzo