import QtQuick 2.4
import QtQuick.Controls 1.2
import QtQuick.Dialogs 1.1
ApplicationWindow {
    id: theWindow
    visible: true
    width: 640
    height: 480

    MessageDialog {
        id: messageDialog
        title: "Hello"
        text: "click Ok"
    }
    MessageDialog {
        id: messageDialog2
        title: "Hello"
        text: "click Ok"
    }

    Timer {
        running: true
        interval: 500
        onTriggered: {
            messageDialog.visible = true
            messageDialog2.visible = true
        }
    }
}