//main buttons
connect(okPB, SIGNAL(clicked()), this, SLOT(slotOK()));
connect(applyPB, SIGNAL(clicked()), this, SLOT(slotApply()));
//main buttons
connect(okPB, SIGNAL(clicked()), this, SLOT(slotOK()));
connect(applyPB, SIGNAL(clicked()), this, SLOT(slotApply()));