Customise DatePicker format

In Silverlight DatePicker control the SelectedDateFormat allows only two values i.e long and short.

When I set it to short the date value in the DatePicker text box is displayed as mm/dd/yyyy.

To display date as dd-mmm-yyyy (or any other format), we need to change the local culture

   public App()
    {
        Thread.CurrentThread.CurrentCulture = new CultureInfo("en-GB");

or change the format of the local culture.

        public App()
    {
        Thread.CurrentThread.CurrentCulture = (CultureInfo) Thread.CurrentThread.CurrentCulture.Clone();
        Thread.CurrentThread.CurrentCulture.DateTimeFormat.ShortDatePattern = "D/m/yyyy";