MonthYearPicker.xaml.cs

using CustomDatePicker.Classes;
using Microsoft.Phone.Controls;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Windows;

namespace CustomDatePicker.View
{
    public partial class MonthYearPicker : DateTimePickerPageBase
    {
        public MonthYearPicker()
        {
            InitializeComponent();

            // Hook up the data sources
            PrimarySelector.DataSource = new YearDataSource();
            SecondarySelector.DataSource = new MonthDataSource();

            InitializeDateTimePickerPage(PrimarySelector, SecondarySelector);
        }

        protected override IEnumerable<Microsoft.Phone.Controls.Primitives.LoopingSelector> GetSelectorsOrderedByCulturePattern()
        {
            string pattern = CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePattern.ToUpperInvariant();

            if (DateShouldFlowRTL())
            {
                char[] reversedPattern = pattern.ToCharArray();
                Array.Reverse(reversedPattern);
                pattern = new string(reversedPattern);
            }

            return GetSelectorsOrderedByCulturePattern(
                pattern,
                new char[] { 'Y', 'M' },
                new Microsoft.Phone.Controls.Primitives.LoopingSelector[] { PrimarySelector, SecondarySelector });
        }

        private bool DateShouldFlowRTL()
        {
            string lang = CultureInfo.CurrentCulture.TwoLetterISOLanguageName;
            return lang == "ar" || lang == "fa";
        }

        internal override void SetFlowDirection(System.Windows.FlowDirection flowDirection)
        {
            HeaderTitle.FlowDirection = flowDirection;

            PrimarySelector.FlowDirection = flowDirection;
            SecondarySelector.FlowDirection = flowDirection;
        }

        protected override void OnOrientationChanged(OrientationChangedEventArgs e)
        {
            if (null == e)
            {
                throw new ArgumentNullException("e");
            }

            base.OnOrientationChanged(e);
            SystemTrayPlaceholder.Visibility = (0 != (PageOrientation.Portrait & e.Orientation)) ?
                Visibility.Visible :
                Visibility.Collapsed;
        }
    }
}