Update AboutWindow.xaml

Author: yanjinhuagood

src/WPFDevelopers.Samples.Shared/ExampleViews/AboutWindow.xaml

@@ -5,7 +5,8 @@
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:ws="https://github.com/WPFDevelopersOrg/WPFDevelopers"
         mc:Ignorable="d" WindowStartupLocation="CenterScreen"
-        SnapsToDevicePixels="True" TextOptions.TextFormattingMode="Display"
+        SnapsToDevicePixels="True" WindowStyle="None"
+        TextOptions.TextFormattingMode="Display"
         ResizeMode="NoResize" 
         Height="400" Width="300" 
         Background="{DynamicResource WD.BackgroundSolidColorBrush}"