Qt Quick Demo - StocQt

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 import QtQuick

 Item {
     id: button
     property bool buttonEnabled: true
     width: 30
     height: 30
     x: 5
     MouseArea {
         id: mouse
         anchors.fill: parent
         onClicked: {
             if (buttonEnabled)
                 buttonEnabled = false;
             else
                 buttonEnabled = true;
         }
     }
     Rectangle {
         id: checkbox
         width: 30
         height: 30
         border.color: "#999999"
         border.width: 1
         antialiasing: true
         radius: 2
         color: "transparent"
         Rectangle {
             anchors.fill: parent
             anchors.margins: 5
             antialiasing: true
             radius: 1
             color: mouse.pressed || buttonEnabled ? "#999999" : "transparent"
         }
     }
 }