qt5.3 qml窗口与Mac上的FramelessWindowHint无法showMinimized和showMaximized，如何修复？

Question

Window {
id: rootWindow
objectName: "rootWindow"
visible: true
width: 980
height: 650
flags: Qt.FramelessWindowHint|Qt.MacWindowToolBarButtonHint|Qt.WindowMinimizeButtonHint|Qt.WindowMaximizeButtonHint

property bool fullscreen: false
}

此窗口无法在macosx 10.9上显示最小化和showMaximized，如何修复？ 感谢