Dialog.qml Example File

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 import Qt 4.7

 Rectangle {
     property string text: ""
     property bool cancelable: true
     signal confirmed();

     id: page
     opacity: 0
     border.width: mainWindow.screenScale
     color: "lightgray"; radius: 5

     width: parent.width - (parent.width * 1/11);
     height: dialogText.height + okButton.height + 35
     anchors.verticalCenter: mainWindow.verticalCenter
     anchors.horizontalCenter: mainWindow.horizontalCenter

     Text {
         id: dialogText
         text: page.text
         font.pointSize: 10 * mainWindow.screenScale
         wrapMode: Text.Wrap
         x: 15; y: 15
         width: parent.width - 20;
         color: "black"
         anchors.horizontalCenter: page.horizontalCenter
         horizontalAlignment: Text.AlignHCenter
     }

     Button {
         id: okButton
         text: "Ok"
         width: 75 * mainWindow.screenScale
         height: 25 * mainWindow.screenScale
         anchors.top: dialogText.bottom; anchors.topMargin: 7

         onClicked: {
             page.confirmed();
             forceClose();
         }
     }

     Button {
         id: noButton
         text: "Cancel"
         width: 75 * mainWindow.screenScale
         height: 25 * mainWindow.screenScale
         anchors.left: page.horizontalCenter; anchors.leftMargin: 5
         anchors.top: dialogText.bottom; anchors.topMargin: 7

         onClicked: {
             forceClose();
         }
     }

     function forceClose()
     {
         page.opacity = 0;
         mainWindow.enableScreen(true);
     }

     Component.onCompleted: {
         if (cancelable == false) {
             noButton.opacity = 0;
             okButton.anchors.horizontalCenter = page.horizontalCenter;
         } else {
             okButton.anchors.right = page.horizontalCenter;
             okButton.anchors.rightMargin = 5;
         }
     }
 }