Added subheaders for Chips.xaml of demo

Author: wongjiahau

MainDemo.Wpf/Chips.xaml

@@ -9,8 +9,8 @@
              mc:Ignorable="d" 
              d:DesignHeight="300" d:DesignWidth="300">
     <ScrollViewer>
-        <codeDisplayer:XamlDisplayerPanel  Margin="32">
-            <TextBlock Style="{StaticResource MaterialDesignTitleTextBlock}">Chips</TextBlock>
+        <codeDisplayer:XamlDisplayerPanel HorizontalAlignment="Center"  Margin="32">
+            <TextBlock Style="{StaticResource MaterialDesignTitleTextBlock}" codeDisplayer:XamlDisplayer.DisplayCode="False">Chips</TextBlock>
             <materialDesign:Chip Content="James Willock" Margin="0 0 6 4">
                 <materialDesign:Chip.Icon>
                     <Image Source="Resources/ProfilePic.jpg" />