dock->findChildren<QAbstractButton*> // clazy:exclude=detaching-temporary
("qt_dockwidget_closebutton").front();
+ // Allow all subwindows to be closed via ESC.
+ close_btn->setShortcut(QKeySequence(Qt::Key_Escape));
+
connect(close_btn, SIGNAL(clicked(bool)),
this, SLOT(on_sub_window_close_clicked()));