delete redundant codes

src/Shared/HandyControl_Shared/Controls/Window/Window.cs

@@ -63,7 +63,7 @@ namespace HandyControl.Controls
 
         public static readonly DependencyProperty NonClientAreaHeightProperty = DependencyProperty.Register(
             "NonClientAreaHeight", typeof(double), typeof(Window),
-            new PropertyMetadata(26.0));
+            new PropertyMetadata(22.0));
 
         public static readonly DependencyProperty ShowNonClientAreaProperty = DependencyProperty.Register(
             "ShowNonClientArea", typeof(bool), typeof(Window),
@@ -80,8 +80,6 @@ namespace HandyControl.Controls
 
         private Thickness _actualBorderThickness;
 
-        private UIElement _nonClientArea;
-
         private bool _showNonClientArea = true;
 
         private double _tempNonClientAreaHeight;
@@ -92,6 +90,8 @@ namespace HandyControl.Controls
 
         private ResizeMode _tempResizeMode;
 
+        private UIElement _nonClientArea;
+
         static Window()
         {
             StyleProperty.OverrideMetadata(typeof(Window), new FrameworkPropertyMetadata(Application.Current.FindResource(ResourceToken.WindowWin10)));