chore(style): add Menu small style.

src/Shared/HandyControl_Shared/Controls/Attach/MenuAttach.cs

@@ -0,0 +1,34 @@
+using System.Windows;
+using HandyControl.Data;
+
+namespace HandyControl.Controls;
+
+public class MenuAttach
+{
+    public static readonly DependencyProperty PopupVerticalOffsetProperty = DependencyProperty.RegisterAttached(
+        "PopupVerticalOffset", typeof(double), typeof(MenuAttach), new PropertyMetadata(ValueBoxes.Double0Box));
+
+    public static void SetPopupVerticalOffset(DependencyObject element, double value)
+        => element.SetValue(PopupVerticalOffsetProperty, value);
+
+    public static double GetPopupVerticalOffset(DependencyObject element)
+        => (double) element.GetValue(PopupVerticalOffsetProperty);
+
+    public static readonly DependencyProperty PopupHorizontalOffsetProperty = DependencyProperty.RegisterAttached(
+        "PopupHorizontalOffset", typeof(double), typeof(MenuAttach), new PropertyMetadata(ValueBoxes.Double0Box));
+
+    public static void SetPopupHorizontalOffset(DependencyObject element, double value)
+        => element.SetValue(PopupHorizontalOffsetProperty, value);
+
+    public static double GetPopupHorizontalOffset(DependencyObject element)
+        => (double) element.GetValue(PopupHorizontalOffsetProperty);
+
+    public static readonly DependencyProperty ItemPaddingProperty = DependencyProperty.RegisterAttached(
+        "ItemPadding", typeof(Thickness), typeof(MenuAttach), new PropertyMetadata(default(Thickness)));
+
+    public static void SetItemPadding(DependencyObject element, Thickness value)
+        => element.SetValue(ItemPaddingProperty, value);
+
+    public static Thickness GetItemPadding(DependencyObject element)
+        => (Thickness) element.GetValue(ItemPaddingProperty);
+}