'Add QDockWidget and toggleViewAction'

def add_dockwidget(self, child):

    (dockwidget, location) = child.create_dockwidget()
    if CONF.get('main', 'vertical_dockwidget_titlebars'):
        dockwidget.setFeatures((dockwidget.features() | QDockWidget.DockWidgetVerticalTitleBar))
    self.addDockWidget(location, dockwidget)
    self.widgetlist.append(child)
