How to create drop shadow for Rectangle on QtQuick 2.0

How can i draw a drop shadow for a Rectangle visual item on QtQuick 2.0?
I like to draw a drop shadow for my main window (I have a transparent and no-decorated window)

As a workaround for the clipped shadow issue, you can put your Rectangle in an Item, with additionnal margin to take blur radius in account, and apply shadow on that container:

import QtQuick 2.0
import QtGraphicalEffects 1.0

Item {
    width: 320
    height: 240

    Item {
        id: container
        anchors.centerIn: parent
        width:  rect.width  + (2 * rectShadow.radius)
        height: rect.height + (2 * rectShadow.radius)
        visible: false

        Rectangle {
            id: rect
            width: 100
            height: 50
            color: "orange"
            radius: 7
            antialiasing: true
            border {
                width: 2
                color: "red"
            }
            anchors.centerIn: parent
        }
    }

    DropShadow {
        id: rectShadow
        anchors.fill: source
        cached: true
        horizontalOffset: 3
        verticalOffset: 3
        radius: 8.0
        samples: 16
        color: "#80000000"
        smooth: true
        source: container
    }
}