XAML replacement for MessageBox.Show - allows centering on parent

SampleCallingCode.cs

YesNoWindow message =
    new YesNoWindow("Confirm Delete", "Are you sure you want to delete this account?");
message.Owner = Window.GetWindow(this);
message.ShowDialog();

if (message.ClickedYes)
{
     AppViewModel.GetInstance().DeleteAccount(selectedAccount);
}

YesNoWindow.xaml

<Window x:Class="AccountManager.Windows.YesNoWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d"
        FontSize="11pt"
        WindowStartupLocation="CenterOwner"
        ResizeMode="NoResize"
        Title="YesNoWindow" 
        SizeToContent="WidthAndHeight">

    <Grid Margin="5,5,5,5">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="10"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>

        <Label Grid.Row="0" Grid.Column="0"
               Grid.ColumnSpan="2"
               x:Name="Message"/>

        <Button Grid.Row="2" Grid.Column="0"
                Content="No"
                Style="{StaticResource SmallButton}"
                Width="75"
                HorizontalAlignment="Left"
                Click="No_OnClick"/>

        <Button Grid.Row="2" Grid.Column="1"
                Content="Yes"
                Style="{StaticResource SmallButton}"
                Width="75"
                HorizontalAlignment="Right"
                Click="Yes_OnClick"/>
    </Grid>

</Window>

YesNoWindow.xaml.cs

using System.Windows;

namespace AccountManager.Windows
{
    public partial class YesNoWindow : Window
    {
        public bool ClickedYes { get; private set; }

        public YesNoWindow(string title, string message)
        {
            InitializeComponent();

            Title = title;
            Message.Content = message;
        }

        private void Yes_OnClick(object sender, RoutedEventArgs e)
        {
            ClickedYes = true;
            Close();
        }

        private void No_OnClick(object sender, RoutedEventArgs e)
        {
            ClickedYes = false;
            Close();
        }
    }
}