public QuotationDetails()
        {
            this.InitializeComponent();
            pageModel = new QuotationDetailsViewModel();
            pageModel.NavigatePortfolio += NavigatePortfolio;
            DataContext = pageModel;
            
            FromCalendar.Date = DateTime.Now.AddDays(-30);
            FromCalendar.MaxDate = DateTime.Now;
            ToCalendar.Date = DateTime.Now;
            ToCalendar.MaxDate = DateTime.Now;

            /*
            SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = AppViewBackButtonVisibility.Visible;

            SystemNavigationManager.GetForCurrentView().BackRequested += (s, e) =>
            {
                Frame.Navigate(typeof(MainPage));
            };
            */
        }
        public QuotationDetails()
        {
            this.InitializeComponent();
            pageModel = new QuotationDetailsViewModel();
            pageModel.NavigatePortfolio += NavigatePortfolio;
            DataContext = pageModel;

            FromCalendar.Date    = DateTime.Now.AddDays(-30);
            FromCalendar.MaxDate = DateTime.Now;
            ToCalendar.Date      = DateTime.Now;
            ToCalendar.MaxDate   = DateTime.Now;

            /*
             * SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = AppViewBackButtonVisibility.Visible;
             *
             * SystemNavigationManager.GetForCurrentView().BackRequested += (s, e) =>
             * {
             *  Frame.Navigate(typeof(MainPage));
             * };
             */
        }