fix mismatched end tag in ControlCatalog/MainView.xaml

samples/ControlCatalog/MainView.xaml

@@ -4,7 +4,7 @@
   <TabControl Classes="sidebar" Name="Sidebar">
     <TabControl.PageTransition>
       <CrossFade Duration="0.25"/>
-    </TabControl.Transition>
+    </TabControl.PageTransition>
     <TabItem Header="AutoCompleteBox"><pages:AutoCompleteBoxPage/></TabItem>
     <TabItem Header="Border"><pages:BorderPage/></TabItem>
     <TabItem Header="Button"><pages:ButtonPage/></TabItem>