Prism/e2e/Wpf/HelloWorld/Dialogs/ConfirmationDialog.xaml

<UserControl x:Class="HelloWorld.Dialogs.ConfirmationDialog"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:prism="http://prismlibrary.com/"
             prism:ViewModelLocator.AutoWireViewModel="True"
             Width="300" Height="150">

    <prism:Dialog.WindowStyle>
        <Style TargetType="Window">
            <Setter Property="prism:Dialog.WindowStartupLocation" Value="CenterScreen" />
            <Setter Property="ResizeMode" Value="NoResize"/>
            <Setter Property="ShowInTaskbar" Value="False"/>
            <Setter Property="SizeToContent" Value="WidthAndHeight"/>
        </Style>
    </prism:Dialog.WindowStyle>

    <Grid x:Name="LayoutRoot" Margin="5">
        <Grid.RowDefinitions>
            <RowDefinition />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>

        <ContentControl HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Grid.Row="0" Content="{Binding Message}"/>

        <StackPanel Grid.Row="1" Orientation="Horizontal" HorizontalAlignment="Right">
            <Button Content="OK" Command="{Binding CloseDialogCommand}" CommandParameter="True" Width="75" Height="25" HorizontalAlignment="Right" Margin="0,10,0,0" />
            <Button Content="Cancel" Command="{Binding CloseDialogCommand}" CommandParameter="False" Width="75" Height="25" HorizontalAlignment="Right" Margin="20,10,0,0" IsDefault="True"/>
        </StackPanel>
    </Grid>
</UserControl>