Calling setEnabled(false) on action returned from QToolBar::addWidget() does not work if the added widget contains other actions like in the following example.

#include <QtGui>
int main(int argc, char **argv)
{
QApplication app(argc, argv);

QMainWindow win(0);
QToolBar *toolbar = new QToolBar(&win);
win.addToolBar(toolbar);

QMenu *mymenu = new QMenu(&win);
QAction *mAction = mymenu->addAction("Bar");

QToolButton *button = new QToolButton(toolbar);
button->setPopupMode(QToolButton::InstantPopup);
button->setText("Foo");
button->setMenu(mymenu);

QAction *a = toolbar->addWidget(button);

//this does not work
a->setEnabled(false);

//this works
//toolbar->widgetForAction(a)->setEnabled(false);

win.show();
return app.exec();
}