Le 19/10/2015 19:20, Rolf-Werner Eilert a écrit : >> > > Finally, I found the reason: I must write tbk.Data.Background, not > tbk.Background. > > That made it so slow! > > Regards > Rolf > Of course, sorry that I didn't see that! It triggers a refresh, and so you get your infinite redraw loop. -- Benoît Minisini