title: Xamarin.Forms Entry with auto thousand and decimal separator
body: <p>I have a Xamarin.Forms entry with numeric keyboard that will represent a pt-BR REAL currency (999.999,99). When I type numbers in the numeric keyboard, the comma(representing decimal) and dot(representind thousand) needs to be added automatically while I am typing.</p>
  
  <p>To achieve this goal, what is the best practice/design pattern in Xamarin.Forms to work in all platforms?</p>