Added contextual tab toggle to sample

Author: yoshiask

Microsoft.Toolkit.Uwp.SampleApp/SamplePages/TabbedCommandBar/TabbedCommandBar.bind

@@ -5,6 +5,11 @@
       xmlns:controls="using:Microsoft.Toolkit.Uwp.UI.Controls"
       mc:Ignorable="d">
     <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition/>
+        </Grid.RowDefinitions>
+        
         <controls:TabbedCommandBar>
             <controls:TabbedCommandBar.PaneFooter>
                 <CommandBar Background="Transparent" DefaultLabelPosition="Right">
@@ -88,7 +93,8 @@
                         <AppBarButton Icon="Add" Label="New item" />
                     </controls:TabbedCommandBarItem.SecondaryCommands>
                 </controls:TabbedCommandBarItem>
-                <controls:TabbedCommandBarItem Header="Shape Format" IsContextual="True">
+                <controls:TabbedCommandBarItem Header="Shape Format" IsContextual="True"
+                                               Visibility="{Binding ElementName=ContextualToggle, Path=IsOn}">
                     <AppBarButton Label="Shape Fill">
                         <AppBarButton.Icon>
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@@ -102,5 +108,10 @@
                 </controls:TabbedCommandBarItem>
             </controls:TabbedCommandBar.MenuItems>
         </controls:TabbedCommandBar>
+
+        <Grid Grid.Row="1">
+            <ToggleSwitch x:Name="ContextualToggle" IsOn="True"
+                          OffContent="Contextual Tab Off" OnContent="Contextual Tab On"/>
+        </Grid>
     </Grid>
 </Page>