Avalonia/samples/MobileSandbox/MainView.axaml

<UserControl x:Class="MobileSandbox.MainView"
             xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mobileSandbox="using:MobileSandbox"
             x:DataType="mobileSandbox:MainView">
  <StackPanel Margin="100 50" Spacing="50">
    <TextBlock Text="Login" Foreground="White" />
    <TextBox TextInputOptions.Multiline="True" AcceptsReturn="True" Watermark="Text" Height="200" TextWrapping="Wrap"/>
    <TextBox Watermark="Username" TextInputOptions.ContentType="Email" TextInputOptions.ReturnKeyType="Done" />
    <TextBox Watermark="Password" PasswordChar="*" TextInputOptions.ContentType="Password" />
    <TextBox Watermark="Pin" PasswordChar="*" TextInputOptions.ContentType="Digits" TextInputOptions.ReturnKeyType="Next" />
    <Button Content="Login" Command="{Binding ButtonCommand}" />
  </StackPanel>
</UserControl>