WPinternals/Views/MessageView.xaml

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<UserControl x:Class="WPinternals.MessageView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:WPinternals"
             mc:Ignorable="d" 
             d:DesignWidth="700">
    <UserControl.Resources>
        <local:ObjectToVisibilityConverter x:Key="ObjectToVisibilityConverter" />
    </UserControl.Resources>
    <Border BorderThickness="1" BorderBrush="#FFD4D4D4" HorizontalAlignment="Stretch" VerticalAlignment="Center">
        <StackPanel Orientation="Vertical" Margin="50,25,50,25">
            <TextBlock Text="{Binding Message}" FontSize="20" TextWrapping="WrapWithOverflow" />
            <TextBlock TextAlignment="Left" Text="{Binding SubMessage}" Visibility="{Binding Path=SubMessage, Converter={StaticResource ObjectToVisibilityConverter}}" Margin="0,10,0,0" TextWrapping="WrapWithOverflow" >
                <TextBlock.Foreground>
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.ControlDarkDarkColorKey}}"/>
                </TextBlock.Foreground>
            </TextBlock>
            <StackPanel Orientation="Horizontal" Width="Auto" Height="Auto" HorizontalAlignment="Right" VerticalAlignment="Bottom" Margin="0,20,0,0">
                <Button Command="{Binding Path=OkCommand, Mode=OneWay}" Content="OK" Width="100" Height="Auto" Padding="0,5" Visibility="{Binding Path=OkCommand, Converter={StaticResource ObjectToVisibilityConverter}}"/>
                <Button Command="{Binding Path=CancelCommand, Mode=OneWay}" Content="Cancel" Width="100" Height="Auto" Padding="0,5" Margin="20,0,0,0" Visibility="{Binding Path=CancelCommand, Converter={StaticResource ObjectToVisibilityConverter}}"/>
            </StackPanel>
        </StackPanel>
    </Border>
</UserControl>