QtQuick.Controls Drawer component ignores "y" parametr

import QtQuick 2.7
import QtQuick.Window 2.0
import QtQuick.Controls 2.0

ApplicationWindow {
    title: qsTr("Hello World")
    width: 480
    height: 800
    visible: true

    Drawer {
        id: drawer
        height: parent.height - 100
        width: parent.width * 0.7
        y: 100
        Component.onCompleted: console.log("drawer: ", x, y);
    }

    Button {
        text: "date picker"
        y: 100
        onClicked: drawer.open()
        Component.onCompleted: console.log("button: ", x, y);
    }
}