src/ScreenGrab/UcCharacter.xaml

<UserControl
    d:DesignHeight="450"
    d:DesignWidth="800"
    mc:Ignorable="d"
    x:Class="ScreenGrab.UcCharacter"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Border
        BorderBrush="White"
        BorderThickness="1"
        Margin="2,0"
        MinWidth="26"
        Padding="3">
        <Border.Resources>
            <Style TargetType="TextBlock">
                <Setter Property="Foreground" Value="White" />
                <Setter Property="FontSize" Value="14" />
                <Setter Property="HorizontalAlignment" Value="Center" />
                <Setter Property="VerticalAlignment" Value="Center" />
            </Style>
        </Border.Resources>
        <TextBlock Text="{Binding DisplayChar, RelativeSource={RelativeSource AncestorType=UserControl}}" x:Name="CharacterText" />
    </Border>
</UserControl>