QML Menu has no text

NCsoft

hi,
recently i need a context menu, and i found a example in QT doc:(http://doc.qt.io/qt-5/qml-qtquick-controls-menu.html).
my problem is :when i click right button, context menu popup with no text on it, its just a white rectangle.
anyone knows how can i solve this?
Here's my code:

Window {
    visible: true
    width: 360
    height: 360

    Rectangle {
        anchors.fill: parent
        color: "#555555"

        MouseArea {
            anchors.fill: parent
            acceptedButtons: Qt.RightButton
            onClicked: {
                edit.popup()
            }
        }
    }

    Menu {
        id: edit
        MenuItem {
            text: "Cut"
            shortcut: "Ctrl+X"
            onTriggered: {
            }
        }

        MenuItem {
            text: "Copy"
            shortcut: "Ctrl+C"
            onTriggered: {
            }
        }

        MenuItem {
            text: "Paste"
            shortcut: "Ctrl+V"
            onTriggered: {
            }
        }
    }
}