Avalonia/samples/Generators.Sandbox/Controls/SignUpView.xaml

<UserControl xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:controls="using:Generators.Sandbox.Controls"
        x:Class="Generators.Sandbox.Controls.SignUpView">
    <StackPanel>
        <controls:CustomTextBox Margin="0 10 0 0"
                 x:Name="UserNameTextBox"
                 Watermark="Please, enter user name..."
                 UseFloatingWatermark="True" />
        <TextBlock x:Name="UserNameValidation" 
                   Foreground="Green"
                   FontSize="12" />
        <TextBox Margin="0 10 0 0"
                 x:Name="PasswordTextBox"
                 Watermark="Please, enter your password..."
                 UseFloatingWatermark="True"
                 PasswordChar="*" />
        <TextBlock x:Name="PasswordValidation" 
                   Foreground="Red"
                   FontSize="12" />
        <TextBox Margin="0 10 0 0"
                 x:Name="ConfirmPasswordTextBox"
                 Watermark="Please, confirm the password..."
                 UseFloatingWatermark="True"
                 PasswordChar="*" />
        <TextBlock x:Name="ConfirmPasswordValidation"
                   TextWrapping="Wrap"
                   Foreground="Red"
                   FontSize="12" />
        <TextBlock>
            <TextBlock.Inlines>
                <InlineCollection>
                    <Run x:Name="SignUpButtonDescription" />
                </InlineCollection>
            </TextBlock.Inlines>
        </TextBlock>
        <Button Margin="0 10 0 5"
                Content="Sign up"
                x:Name="SignUpButton" />
        <TextBlock x:Name="CompoundValidation"
                   TextWrapping="Wrap"
                   Foreground="Red"
                   FontSize="12" />
    </StackPanel>
</UserControl>