Pages should be alphabetically ordered.

samples/ControlCatalog/MainView.xaml

@@ -17,7 +17,6 @@
     <TabItem Header="Expander"><pages:ExpanderPage/></TabItem>
     <TabItem Header="Image"><pages:ImagePage/></TabItem>
     <TabItem Header="LayoutTransformControl"><pages:LayoutTransformControlPage/></TabItem>
-    <TabItem Header="Viewbox"><pages:ViewboxPage/></TabItem>
     <TabItem Header="ListBox"><pages:ListBoxPage/></TabItem>
     <TabItem Header="Menu"><pages:MenuPage/></TabItem>
 	<TabItem Header="NumericUpDown"><pages:NumericUpDownPage/></TabItem>
@@ -28,5 +27,6 @@
     <TabItem Header="ToolTip"><pages:ToolTipPage/></TabItem>
     <TabItem Header="TreeView"><pages:TreeViewPage/></TabItem>
     <TabItem Header="TabControl"><pages:TabControlPage/></TabItem>
+    <TabItem Header="Viewbox"><pages:ViewboxPage/></TabItem>
   </TabControl>
 </UserControl>