customize shadow effect form

[MrCoder]

Hi, I want to make a custom window and let it shadow effects
To do this I used the following code, but do not work

ApplicationWindow {
    id: win
    flags: Qt.FramelessWindowHint | Qt.NonModal
        DropShadow {
            anchors.fill: parent
            horizontalOffset: 3
            verticalOffset: 3
            radius: 8.0
            samples: 17
            color: "#80000000"
            source: parent
        }
}

ApplicationWindow {
    id: win
    flags: Qt.FramelessWindowHint | Qt.NonModal
        DropShadow {
            anchors.fill: parent
            horizontalOffset: 3
            verticalOffset: 3
            radius: 8.0
            samples: 17
            color: "#80000000"
            source: parent
        }
}

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