fixes #175

Author: AndreiMisiukevich

PanCardView/CardsView.cs

@@ -433,18 +433,24 @@ public ICommand ItemSwipedCommand
         public object this[int index] => ItemsSource?.FindValue(index);
 
         public static void Preserve()
-        => new List<Type>
-        {
-            typeof(CarouselView),
-            typeof(CoverFlowView),
-            typeof(ArrowControl),
-            typeof(LeftArrowControl),
-            typeof(RightArrowControl),
-            typeof(CircleFrame),
-            typeof(IndicatorItemView),
-            typeof(IndicatorsControl),
-            typeof(ParentScrollView)
-        }.Clear();
+        {
+            ArrowControl.Preserve();
+            CircleFrame.Preserve();
+            IndicatorsControl.Preserve();
+            ParentScrollView.Preserve();
+            new List<Type>
+            {
+                typeof(CarouselView),
+                typeof(CoverFlowView),
+                typeof(ArrowControl),
+                typeof(LeftArrowControl),
+                typeof(RightArrowControl),
+                typeof(CircleFrame),
+                typeof(IndicatorItemView),
+                typeof(IndicatorsControl),
+                typeof(ParentScrollView)
+            }.Clear();
+        }
 
         public void OnPanUpdated(object sender, PanUpdatedEventArgs e)
         => OnPanUpdated(e);

PanCardView/Controls/ArrowControl.cs

@@ -124,6 +124,10 @@ public ArrowControl()
             });
         }
 
+        public static void Preserve()
+        {
+        }
+
         protected override void OnParentSet()
         {
             base.OnParentSet();

PanCardView/Controls/CircleFrame.cs

@@ -19,6 +19,10 @@ public CircleFrame()
             Padding = 0;
         }
 
+        public static void Preserve()
+        {
+        }
+
         public double Size
         {
             get => (double)GetValue(SizeProperty);

PanCardView/Controls/IndicatorsControl.cs

@@ -155,6 +155,10 @@ public int ToFadeDuration
 
         public object this[int index] => IndicatorsContexts?.FindValue(index);
 
+        public static void Preserve()
+        {
+        }
+
         protected override void OnParentSet()
         {
             base.OnParentSet();

PanCardView/Controls/ParentScrollView.cs

@@ -6,6 +6,10 @@ public class ParentScrollView : ScrollView, IOrdinateHandlerParentView
     {
         private double _prevY;
 
+        public static void Preserve()
+        {
+        }
+
         public virtual void HandleOrdinateValue(double y, bool isFirst)
         {
             if (isFirst)