Synchronize the Net40

1. synchronize the Net40
2. fixed a bug of coverview

Net40/HandyControlDemo_Net40/UserControl/Styles/LabelDemoCtl.xaml.cs

@@ -0,0 +1,10 @@
+namespace HandyControlDemo.UserControl
+{
+    public partial class LabelDemoCtl
+    {
+        public LabelDemoCtl()
+        {
+            InitializeComponent();
+        }
+    }
+}