VisualElement的VisualTree错误（不完整）

WpfView/VisualElement.cs

@@ -95,6 +95,7 @@ namespace LiveCharts.Wpf
             if (UIElement.Parent == null)
             {
                 chart.View.AddToDrawMargin(UIElement);
+                chart.View.AddToDrawMargin(this);
                 Panel.SetZIndex(UIElement, 1000);
             }
 
@@ -175,6 +176,7 @@ namespace LiveCharts.Wpf
         public void Remove(ChartCore chart)
         {
             chart.View.RemoveFromDrawMargin(UIElement);
+            chart.View.RemoveFromDrawMargin(this);
         }
 
         private static void PropertyChangedCallback(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)