优化更新代码，添加界面功能并整合

WPFluent/Controls/CheckComboBox/CheckComboBoxItem.cs

@@ -0,0 +1,63 @@
+using System.Windows.Controls;
+
+namespace WPFluent.Controls
+{
+    /// <summary>
+    /// 选择行
+    /// </summary>
+    public class CheckComboBoxItem : ListBoxItem
+    {
+        #region Constructors
+        static CheckComboBoxItem()
+        {
+            DefaultStyleKeyProperty.OverrideMetadata(
+                typeof(CheckComboBoxItem),
+                new FrameworkPropertyMetadata(typeof(CheckComboBoxItem)));
+        }
+        #endregion
+
+        public CheckComboBoxItem()
+        {
+        }
+
+        #region PrivateProperty
+        /// <summary>
+        /// 包含该CheckComboBoxItem的CheckComboBox控件
+        /// </summary>
+        private CheckComboBox ParentCheckComboBox
+        {
+            get { return ItemsControl.ItemsControlFromItemContainer(this) as CheckComboBox; }
+        }
+        #endregion
+
+        #region Override
+        public override void OnApplyTemplate()
+        {
+            base.OnApplyTemplate();
+        }
+        #endregion
+
+        #region DependencyProperty
+        public new static readonly DependencyProperty IsSelectedProperty = DependencyProperty.Register(
+            nameof(IsSelected),
+            typeof(bool),
+            typeof(CheckComboBoxItem),
+            new PropertyMetadata(false, OnSelectedChanged));
+
+        /// <summary>
+        /// 选中
+        /// </summary>
+        public new bool IsSelected
+        {
+            get { return (bool)GetValue(IsSelectedProperty); }
+            set { SetValue(IsSelectedProperty, value); }
+        }
+
+        private static void OnSelectedChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+        {
+            var ComboBoxItem = d as CheckComboBoxItem;
+            ComboBoxItem?.ParentCheckComboBox?.NotifyCheckComboBoxItemClicked(ComboBoxItem);
+        }
+        #endregion
+    }
+}