title: Setting keyboard in Xamarin.Forms Entry
body: <p>i have derived a CustomEntry from Entry.
  The first letter has to be in upper case, so I use Keyboard.Chat or Keyboard.Text (with same effect)
  If I "tap" into those Entries everything works fine.
  But I have to set the focus programmatically to get from one to the other.
  Unfortunately on iOS the Keyboards Shift-Key is not set, when I focus the entry programatically.
  Funnily if I tap the backspace (on the programatically focused entry) the shift-key is set....
  On Android everything is fine.</p>
  
  <p>So far I've tried to set Keyboard on focus event and setting Backspace into the text. But nothing helps.</p>
  
  <p>Any idea?.</p>
  
  <p>Greetings Michael</p>