add basic files

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

@@ -0,0 +1,55 @@
+using System.Windows;
+using HandyControl.Data;
+
+namespace HandyControl.Controls
+{
+    public class SideMenuItem : HeaderedSimpleItemsControl, ISelectable
+    {
+        public static readonly DependencyProperty IconProperty = DependencyProperty.Register(
+            "Icon", typeof(object), typeof(SideMenuItem), new PropertyMetadata(default(object)));
+
+        public object Icon
+        {
+            get => GetValue(IconProperty);
+            set => SetValue(IconProperty, value);
+        }
+
+        protected virtual void OnSelected(RoutedEventArgs e) => RaiseEvent(e);
+
+        public static readonly RoutedEvent SelectedEvent =
+            EventManager.RegisterRoutedEvent("Selected", RoutingStrategy.Bubble,
+                typeof(RoutedEventHandler), typeof(SideMenuItem));
+
+        public event RoutedEventHandler Selected
+        {
+            add => AddHandler(SelectedEvent, value);
+            remove => RemoveHandler(SelectedEvent, value);
+        }
+
+        public static readonly DependencyProperty IsSelectedProperty = DependencyProperty.Register(
+            "IsSelected", typeof(bool), typeof(SideMenuItem), new PropertyMetadata(ValueBoxes.FalseBox));
+
+        public bool IsSelected
+        {
+            get => (bool) GetValue(IsSelectedProperty);
+            set => SetValue(IsSelectedProperty, value);
+        }
+
+        private static readonly DependencyPropertyKey RolePropertyKey =
+            DependencyProperty.RegisterReadOnly(nameof(Role), typeof(SideMenuItemRole), typeof(SideMenuItem),
+                new PropertyMetadata(SideMenuItemRole.Header));
+
+        public static readonly DependencyProperty RoleProperty = RolePropertyKey.DependencyProperty;
+
+        public SideMenuItemRole Role => (SideMenuItemRole) GetValue(RoleProperty);
+
+        protected override DependencyObject GetContainerForItemOverride() => new SideMenuItem();
+
+        protected override bool IsItemItsOwnContainerOverride(object item) => item is SideMenuItem;
+
+        private void UpdateRole()
+        {
+            
+        }
+    }
+}