title: Force dot in numeric keyboard for decimal separator in WinRT Windows Phone 8.1
body: <p>I use TextBox for show/edit some decimal data with InputScope="Number". 
  I want to get always dot in numeric keyboard regardless settings of the phone itself (it could be comma or dot regarding phone settings).<br>
  I tried in App.xaml.cs with next code but with no success (I force the culture, don't ask why):</p>
  
  <pre><code>var culture = new CultureInfo("en-US");
  Windows.Globalization.ApplicationLanguages.PrimaryLanguageOverride = culture.Name;
  culture.NumberFormat.NumberDecimalSeparator = ".";
  culture.NumberFormat.CurrencyDecimalSeparator = ".";
  CultureInfo.DefaultThreadCurrentCulture = culture;
  CultureInfo.DefaultThreadCurrentUICulture = culture;
  </code></pre>
  
  <p>Everything work just fine except the fact that keyboard always shows comma as default separator (on phone with regional setting that have comma as default).</p>
  
  <p>I know that I could long tap on the comma to get dot but that don't know every user.</p>