add SplitButtonItem

src/Shared/HandyControl_Shared/Controls/Button/SplitButton.cs

@@ -1,18 +0,0 @@
-using System.Windows;
-using System.Windows.Controls.Primitives;
-using HandyControl.Data.Enum;
-
-namespace HandyControl.Controls
-{
-    public class SplitButton : ButtonBase
-    {
-        public static readonly DependencyProperty HitModeProperty = DependencyProperty.Register(
-            "HitMode", typeof(MouseHitMode), typeof(SplitButton), new PropertyMetadata(default(MouseHitMode)));
-
-        public MouseHitMode HitMode
-        {
-            get => (MouseHitMode) GetValue(HitModeProperty);
-            set => SetValue(HitModeProperty, value);
-        }
-    }
-}