BPA.SingleDevice/BPA.UIControl/MessageBoxWindow.xaml

<Window x:Class="BPA.UIControl.MessageBoxWindow"
        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"
        MinWidth="270"
        MinHeight="150"
        Margin="10"
        HorizontalContentAlignment="Center"
        VerticalContentAlignment="Center"
        AllowsTransparency="True"
        Background="Transparent"
        LostKeyboardFocus="Window_LostKeyboardFocus"
        PreviewLostKeyboardFocus="Window_PreviewLostKeyboardFocus"
        ShowInTaskbar="False"
        WindowStartupLocation="CenterOwner"
        WindowStyle="None"
        mc:Ignorable="d">

    <Border x:Name="messageBoxPanel"
            HorizontalAlignment="Center"
            VerticalAlignment="Center" />
</Window>