QuitButton.qml Example File

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 import Qt 4.7
 Image {
     source: "quit.png"
     scale: quitMouse.pressed ? 0.8 : 1.0
     smooth: quitMouse.pressed
     MouseArea {
         id: quitMouse
         anchors.fill: parent
         anchors.margins: -10
         onClicked: Qt.quit()
     }
 }