update to v1.4.0

HandyControlDemo/UserControl/Controls/NumericUpDownDemoCtl.xaml

@@ -3,7 +3,7 @@
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:controls="clr-namespace:HandyControl.Controls;assembly=HandyControl"
              xmlns:langs="clr-namespace:HandyControlDemo.Properties.Langs"
-             Background="White">
+             Background="{DynamicResource RegionBrush}">
     <controls:TransitioningContentControl>
         <StackPanel Margin="32">
             <controls:NumericUpDown x:Name="NumericUpDown"/>