<local:MyEntry x:Name="txtFirstName"
       Placeholder="First Name"
       Keyboard="Text"
       TextColor="DarkBlue"
       PlaceholderColor="DarkBlue"
       Completed="NameCompleted"
       HorizontalOptions="Start"
       WidthRequest="300"
       Text="{Binding FirstName, Mode=TwoWay}"
     />

    <local:MyEntry x:Name="txtLastName"
       Placeholder="Last Name"
       Keyboard="Text"
       TextColor="DarkBlue"
       PlaceholderColor="DarkBlue"
       Completed="NameCompleted"
       HorizontalOptions="Start"
       WidthRequest="300"
       Text="{Binding Surname, Mode=TwoWay}"
     />

protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
 {
   base.OnElementChanged(e);

   if (Control != null)
   {
     Control.SetRawInputType(InputTypes.TextFlagNoSuggestions | InputTypes.TextCapSentences);
     Control.Background.SetColorFilter(Android.Graphics.Color.Black, PorterDuff.Mode.SrcAtop);
    }
  }