@SGaist
thank you SGaist for your kind replay
honestly all the tense & anxiety & obsecurity is gone thanks to matthew & you
i know now what to focus on & what's the matter with Qt
Qt is uses RAW C++ codes & don't hide any mechanism from the user
hence they required you to communicate with it in RAW format codes
it's really helpful to talk with experts ^_^

Ok, I've found that the results are stored in files Makefile.Release, Makefile.Debug and everything is explained here.

As long as var inherits QObject you can do as followed.

QSignalMapper *sigMap = new QSignalMapper(); connect(sigMap,SIGNAL(mapped(QObject *)),this,SLOT(compareLimit(QObject*))); void storeRoStruct() { for (int x=0; x<DB.length(); x++){ conditionList.append(DB.record(x); connect(conditionList.at(x).var, SIGNAL(valueChanged()), sigMap, SLOT(map())); sigMap->setMapping(conditionList.at(x).var, conditionList.at(x).var); } }

And in the Slot make a dynamic_cast to var.

@maximo
Ok :)
I am going to test again with stylesheets.
It would be very nice it it worked as docs says.
Or at least to understand why it did not.

Update:
Ok, one must unpolish/ polish each widget as doing it to
Mainwindow doesn't seems to work.
But it also works with
setStyleSheet(styleSheet());
in MainWindow to reload (whole) style sheet.

Update 2:
Ok. Having qframes with bool error property.
It will update in Designer, if setting it.
No code. Sheet on MWindow.
So it does work with properties it seems.