Excuse me for having deleted a question as somebody answered me. The problem was that I found another solution, very simpler as a dbgrid component in the RX library did all that I wanted.
I posted a comment but deleted the question as the same time, so you did'nt see the comment.
Thanks for all your comments,
excuse me again for the trouble and my bad english
Christophe MONIN (LogoSapience)