MessageWindow now opens in CenterScreen

inabox.wpf/Forms/MessageWindow.xaml

@@ -9,6 +9,7 @@
         MinWidth="280"
         SizeToContent="Height"
         x:Name="Window"
+        WindowStartupLocation="CenterScreen"
         DataContext="{Binding ElementName=Window}">
     <Window.Resources>
         <DataTemplate x:Key="ButtonTemplate" DataType="local:MessageWindowButton">