* 重构一些控件的Dispose事件

SunnyUI/Controls/UIImageListBox.cs

@@ -80,6 +80,13 @@ namespace Sunny.UI
             listbox.DrawItem += Listbox_DrawItem;
         }
 
+        protected override void Dispose(bool disposing)
+        {
+            base.Dispose(disposing);
+            bar?.Dispose();
+            listbox?.Dispose();
+        }
+
         private int scrollBarWidth = 0;
 
         [DefaultValue(0), Category("SunnyUI"), Description("垂直滚动条宽度，最小为原生滚动条宽度")]

SunnyUI/Controls/UIListBox.cs

@@ -180,6 +180,9 @@ namespace Sunny.UI
             base.Dispose(disposing);
             timer?.Stop();
             timer?.Dispose();
+
+            bar?.Dispose();
+            listbox?.Dispose();
         }
 
         public new event EventHandler MouseLeave;

SunnyUI/Controls/UITreeView.cs

@@ -94,8 +94,9 @@ namespace Sunny.UI
             view.MouseClick += View_MouseClick;
         }
 
-        ~UITreeView()
+        protected override void Dispose(bool disposing)
         {
+            base.Dispose(disposing);
             view?.Dispose();
             Bar?.Dispose();
             HBar?.Dispose();