vStationURM/Tools/SonopostSearchTool/CustomMessageBox.xaml

<Window x:Class="SonopostSearchTool.CustomMessageBox"
        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:SonopostSearchTool"
        mc:Ignorable="d" x:Name="main"
        Title="{DynamicResource Title}" Height="130" Width="280" Background="{x:Null}"
        WindowStyle="None" ResizeMode="NoResize" AllowsTransparency="True" WindowStartupLocation="CenterScreen">

    <Window.Resources>
    </Window.Resources>

    <Border Background="{StaticResource MainTheme}" Opacity="1" CornerRadius="3">
        <Canvas>

            <Border Canvas.Top="0" Height="25" Width="{Binding ElementName=main, Path=Width,UpdateSourceTrigger=PropertyChanged}" 
                    BorderThickness="0,0,0,1" BorderBrush="#FFEFE2E2">
                <TextBlock x:Name="lblTitle" Text="test" HorizontalAlignment="Left" 
                           Foreground="#FFCBBEBE" FontSize="14"
                           VerticalAlignment="Center" Margin="5"/>
            </Border>
            <TextBlock x:Name="lblMsg"
                       Foreground="White" FontSize="14" 
                       TextWrapping="Wrap" Text="test"
                       HorizontalAlignment="Center" Canvas.Left="20"
                       Canvas.Top="50" />
            <Border BorderBrush="#FF60C1C1" BorderThickness="0.5" Height="22" 
                    Canvas.Bottom="10" Canvas.Right="30" MouseLeftButtonDown="Yes_MouseLeftButtonDown"
                    Name="border1" Width="49" Background="#FFC7C7C7" CornerRadius="2">
                <TextBlock Text="{DynamicResource Confirm}"  HorizontalAlignment="Center" VerticalAlignment="Center"/>
            </Border>
        </Canvas>
    </Border>
</Window>