Add option for vertical PageSlide to Carousel test page in ControlCatalog

samples/ControlCatalog/Pages/CarouselPage.xaml

@@ -9,7 +9,7 @@
       </Button>
       <Carousel Name="carousel">
         <Carousel.Transition>
-          <PageSlide Duration="0.25"/>
+          <PageSlide Duration="0.25" Orientation="Vertical" />
         </Carousel.Transition>
         <Image Source="resm:ControlCatalog.Assets.delicate-arch-896885_640.jpg"/>
         <Image Source="resm:ControlCatalog.Assets.hirsch-899118_640.jpg"/>
@@ -28,6 +28,14 @@
         <DropDownItem>Crossfade</DropDownItem>
       </DropDown>
     </StackPanel>
+
+    <StackPanel Orientation="Horizontal" Gap="4">
+      <TextBlock VerticalAlignment="Center">Orientation</TextBlock>
+      <DropDown Name="orientation" SelectedIndex="1" VerticalAlignment="Center">
+        <DropDownItem>Horizontal</DropDownItem>
+        <DropDownItem>Vertical</DropDownItem>
+      </DropDown>
+    </StackPanel>
     
   </StackPanel>
 </UserControl>

samples/ControlCatalog/Pages/CarouselPage.xaml.cs

@@ -11,6 +11,7 @@ namespace ControlCatalog.Pages
         private Button _left;
         private Button _right;
         private DropDown _transition;
+        private DropDown _orientation;
 
         public CarouselPage()
         {
@@ -18,6 +19,7 @@ namespace ControlCatalog.Pages
             _left.Click += (s, e) => _carousel.Previous();
             _right.Click += (s, e) => _carousel.Next();
             _transition.SelectionChanged += TransitionChanged;
+            _orientation.SelectionChanged += TransitionChanged;
         }
 
         private void InitializeComponent()
@@ -27,6 +29,7 @@ namespace ControlCatalog.Pages
             _left = this.FindControl<Button>("left");
             _right = this.FindControl<Button>("right");
             _transition = this.FindControl<DropDown>("transition");
+            _orientation = this.FindControl<DropDown>("orientation");
         }
 
         private void TransitionChanged(object sender, SelectionChangedEventArgs e)
@@ -37,7 +40,7 @@ namespace ControlCatalog.Pages
                     _carousel.Transition = null;
                     break;
                 case 1:
-                    _carousel.Transition = new PageSlide(TimeSpan.FromSeconds(0.25));
+                    _carousel.Transition = new PageSlide(TimeSpan.FromSeconds(0.25), _orientation.SelectedIndex == 0 ? PageSlide.SlideAxis.Horizontal : PageSlide.SlideAxis.Vertical);
                     break;
                 case 2:
                     _carousel.Transition = new CrossFade(TimeSpan.FromSeconds(0.25));