Sorry for asking that again mouser.
I may have miss something in the FARR behaviour or the plugin SDK.
I tried various plugins and I have the impression that FARR only update display when search is complete or when plugin tell they have Stopped. During the search FARR query results from the plugins progressively but it does not display them. Is it normal ?
With the internal file search if I type something like c:\\a.* files are found progressively and show up when found even if FARR is still searching. I can't find a way to get this behavior.