optimized performance

src/Shared/HandyControl_Shared/Controls/SideMenu/SideMenu.cs

@@ -127,7 +127,7 @@ namespace HandyControl.Controls
         public bool AutoSelect
         {
             get => (bool) GetValue(AutoSelectProperty);
-            set => SetValue(AutoSelectProperty, value);
+            set => SetValue(AutoSelectProperty, ValueBoxes.BooleanBox(value));
         }
 
         public static readonly DependencyProperty ExpandModeProperty = DependencyProperty.Register(

src/Shared/HandyControl_Shared/Controls/SideMenu/SideMenuItem.cs

@@ -102,7 +102,7 @@ namespace HandyControl.Controls
         public bool IsSelected
         {
             get => (bool) GetValue(IsSelectedProperty);
-            set => SetValue(IsSelectedProperty, value);
+            set => SetValue(IsSelectedProperty, ValueBoxes.BooleanBox(value));
         }
 
         public static readonly DependencyProperty RoleProperty = DependencyProperty.Register(