added two editors

src/Shared/HandyControl_Shared/Tools/StyleSelector/ComboBoxItemCapsuleStyleSelector.cs

@@ -0,0 +1,30 @@
+using System.Windows;
+using System.Windows.Controls;
+using HandyControl.Data;
+
+namespace HandyControl.Tools
+{
+    public class ComboBoxItemCapsuleStyleSelector : StyleSelector
+    {
+        public override Style SelectStyle(object item, DependencyObject container)
+        {
+            if (container is ComboBoxItem comboBoxItem && VisualHelper.GetParent<ComboBox>(comboBoxItem) is { } comboBox)
+            {
+                var count = comboBox.Items.Count;
+                if (count == 1)
+                {
+                    return ResourceHelper.GetResource<Style>(ResourceToken.ComboBoxItemCapsuleSingle);
+                }
+
+                var index = comboBox.ItemContainerGenerator.IndexFromContainer(comboBoxItem);
+                return index == 0
+                    ? ResourceHelper.GetResource<Style>(ResourceToken.ComboBoxItemCapsuleHorizontalFirst)
+                    : ResourceHelper.GetResource<Style>(index == count - 1
+                        ? ResourceToken.ComboBoxItemCapsuleHorizontalLast
+                        : ResourceToken.ComboBoxItemCapsuleDefault);
+            }
+
+            return null;
+        }
+    }
+}

src/Shared/HandyControl_Shared/Tools/StyleSelector/TabItemCapsuleStyleSelector.cs

@@ -8,7 +8,7 @@ namespace HandyControl.Tools
     {
         public override Style SelectStyle(object item, DependencyObject container)
         {
-            if (item is TabItem tabItem && tabItem.Parent is TabControl tabControl)
+            if (container is TabItem tabItem && VisualHelper.GetParent<TabControl>(tabItem) is { } tabControl)
             {
                 var count = tabControl.Items.Count;
                 if (count == 1)
@@ -16,7 +16,7 @@ namespace HandyControl.Tools
                     return ResourceHelper.GetResource<Style>(ResourceToken.TabItemCapsuleSingle);
                 }
 
-                var index = tabControl.Items.IndexOf(tabItem);
+                var index = tabControl.ItemContainerGenerator.IndexFromContainer(tabItem);
                 return index == 0
                     ? ResourceHelper.GetResource<Style>(
                         tabControl.TabStripPlacement == Dock.Top || tabControl.TabStripPlacement == Dock.Bottom