addButton        1108 modules/highgui/src/window_QT.cpp void GuiReceiver::addButton(QString button_name, int button_type, int initial_button_state, void* on_change, void* userdata)
addButton        1396 modules/highgui/src/window_QT.cpp void CvButtonbar::addButton(QString name, CvButtonCallback call, void* userdata,  int button_type, int initial_button_state)