is this what you what?
...
action->setCheckable(true);
QMenu *menu
= menuBar
()->addMenu
(tr
("File"));
menu->addAction(action);
pb->setCheckable(true);
connect(action, SIGNAL(toggled(bool)), pb, SLOT(setChecked(bool)));
connect(pb, SIGNAL(toggled(bool)), action, SLOT(setChecked(bool)));
...
...
QAction *action = new QAction(tr("Action"), this);
action->setCheckable(true);
QMenu *menu = menuBar()->addMenu(tr("File"));
menu->addAction(action);
QPushButton *pb = new QPushButton(tr("Button"), this);
pb->setCheckable(true);
connect(action, SIGNAL(toggled(bool)), pb, SLOT(setChecked(bool)));
connect(pb, SIGNAL(toggled(bool)), action, SLOT(setChecked(bool)));
...
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