self.toolBar.widgetForAction(self.backAction).setPopupMode(QToolButton.DelayedPopup)
self.toolBar.widgetForAction(self.forwardAction).setPopupMode(QToolButton.DelayedPopup)
self.toolBar.widgetForAction(self.upAction).setPopupMode(QToolButton.DelayedPopup)

self.toolBar.widgetForAction(self.backAction).setPopupMode(QToolButton.DelayedPopup)
self.toolBar.widgetForAction(self.forwardAction).setPopupMode(QToolButton.DelayedPopup)
self.toolBar.widgetForAction(self.upAction).setPopupMode(QToolButton.DelayedPopup)
