diff --git a/MessageBox.axaml b/MessageBox.axaml
index 84b78ed..eb215f7 100644
--- a/MessageBox.axaml
+++ b/MessageBox.axaml
@@ -3,7 +3,7 @@
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         mc:Ignorable="d" SizeToContent="WidthAndHeight"
-        x:Class="spplus.MessageBox"
+        x:Class="spplus.MessageBox" WindowStartupLocation="CenterScreen"
         Title="MessageBox">
     <StackPanel>
         <TextBlock Name="Text" Margin="10" TextWrapping="Wrap" />