yes it works now, i've included the QHBoxLayout and QVBoxLayout in the finddialog.cpp then i guess i have typos in case sensivity area anyway i got it all work now with your help and thank you again,

by the way before i continue my reading in qt book, do you have any more tips or suggestion so i cant ask again cuz i might bother someone again which is not good for the busy people around working for the better tomorrow...I mean as long as i add this QT += widgets in the .pro file, ill be running both qt 4 and 5, then also i'll goind to read the link you gave to me then nothing more.....



case Solved