prs/prs.desktop/Forms/ReconnectionWindow.xaml

<Window x:Class="PRSDesktop.Forms.ReconnectionWindow"
        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"
        xmlns:local="clr-namespace:PRSDesktop.Forms"
        mc:Ignorable="d"
        WindowStartupLocation="CenterScreen"
        WindowStyle="None"
        BorderThickness="0"
        BorderBrush="Transparent"
        AllowsTransparency="True"
        Background="Transparent"
        MouseDown="Window_MouseDown"
        Width="350" Height="200"
        Title="Reconnecting">
    <Border CornerRadius="10" BorderBrush="Gray" BorderThickness="0.75" Padding="5,5,5,0" Background="White">
        <Grid Margin="5">
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto"/>
                <RowDefinition Height="*"/>
                <RowDefinition Height="Auto"/>
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="Auto"/>
            </Grid.ColumnDefinitions>
            <Image Grid.Row="0" Grid.RowSpan="2" Grid.Column="0" Grid.ColumnSpan="2"
                   x:Name="Splash" Margin="20,10,20,10" Stretch="Uniform" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" />
            <Button x:Name="CloseButton" Content="Exit PRS"
                    Grid.Row="0" Grid.Column="1"
                    Background="LightYellow" Padding="5" Margin="5"
                    Click="CloseButton_Click">
                <Button.Style>
                    <Style TargetType="Button">
                        <Style.Resources>
                            <Style TargetType="Border">
                                <Setter Property="CornerRadius" Value="10"/>
                            </Style>
                        </Style.Resources>
                    </Style>
                </Button.Style>
            </Button>

            <Label Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="2"
                   VerticalAlignment="Stretch" HorizontalAlignment="Stretch"
                   HorizontalContentAlignment="Center"
                   FontSize="14" FontStyle="Oblique"
                   Margin="0"
                   Content="Connection lost; attempting to reconnect ..."/>
        </Grid>
    </Border>
</Window>