public PromptUserDlg()
        {
            this.InitializeComponent();
            _dialogPopup = new Popup {
                Child = this
            };
            _dialogPopup.Transitions = new TransitionCollection();
            var trans = new PopupThemeTransition();

            trans.FromHorizontalOffset = 400;
            _dialogPopup.Transitions.Add(trans);
        }
        public PageBase()
        {
            Transitions = new TransitionCollection();
#if WINDOWS_PHONE_APP
            var theme = new NavigationThemeTransition
            {
                DefaultNavigationTransitionInfo = new SlideNavigationTransitionInfo()
            };
            Transitions.Add(theme);
#else
            var theme = new PopupThemeTransition()
            {
                FromVerticalOffset = -200
            };
            Transitions.Add(theme);
#endif
        }