Ground work for Wino Calendar. (#475)

Wino Calendar abstractions.

Wino.Calendar/Controls/CustomCalendarFlipView.cs

@@ -0,0 +1,42 @@
+using Windows.UI.Xaml.Automation.Peers;
+using Windows.UI.Xaml.Controls;
+
+namespace Wino.Calendar.Controls
+{
+    /// <summary>
+    /// FlipView that hides the navigation buttons and exposes methods to navigate to the next and previous items with animations.
+    /// </summary>
+    public class CustomCalendarFlipView : FlipView
+    {
+        private const string PART_PreviousButton = "PreviousButtonHorizontal";
+        private const string PART_NextButton = "NextButtonHorizontal";
+
+        private Button PreviousButton;
+        private Button NextButton;
+
+        protected override void OnApplyTemplate()
+        {
+            base.OnApplyTemplate();
+
+            PreviousButton = GetTemplateChild(PART_PreviousButton) as Button;
+            NextButton = GetTemplateChild(PART_NextButton) as Button;
+
+            // Hide navigation buttons
+            PreviousButton.Opacity = NextButton.Opacity = 0;
+            PreviousButton.IsHitTestVisible = NextButton.IsHitTestVisible = false;
+        }
+
+        public void GoPreviousFlip()
+        {
+            var backPeer = new ButtonAutomationPeer(PreviousButton);
+            backPeer.Invoke();
+        }
+
+        public void GoNextFlip()
+        {
+            var nextPeer = new ButtonAutomationPeer(NextButton);
+            nextPeer.Invoke();
+        }
+
+    }
+}