Here is a complete listing of the example source file.
import QtQuick 2.0
 
 
    backgroundImage.source: 
Qt.resolvedUrl(
"images/christmas.jpg")
 
    passwordInput: Keypad {
        HiddenButton {
            x: 90
            y: 795
            implicitWidth: 300
            implicitHeight: 300
 
            text: "0"
 
            radius: width * 0.5
        }
 
        HiddenButton {
            x: 338
            y: 553
            implicitWidth: 440
            implicitHeight: 440
 
            text: "1"
 
            radius: width * 0.5
        }
 
        HiddenButton {
            x: 955
            y: 445
            implicitWidth: 455
            implicitHeight: 455
 
            text: "2"
 
            radius: width * 0.5
        }
    }
}