add TextBox control

now you can clear and verify the text of textbox

HandyControlDemo/UserControl/Controls/AnimationPathDemoCtl.xaml.cs

@@ -1,9 +1,6 @@
 // ReSharper disable once CheckNamespace
 namespace HandyControlDemo.UserControl
 {
-    /// <summary>
-    /// AnimationPathDemoCtl.xaml 的交互逻辑
-    /// </summary>
     public partial class AnimationPathDemoCtl
     {
         public AnimationPathDemoCtl()