modified some styles

src/Shared/HandyControl_Shared/Themes/Styles/Base/RadioButtonBaseStyle.xaml

@@ -150,7 +150,7 @@
 
     <Style x:Key="RadioGroupItemBaseStyle" TargetType="RadioButton">
         <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
-        <Setter Property="Background" Value="{DynamicResource DefaultBrush}"/>
+        <Setter Property="Background" Value="{DynamicResource RegionBrush}"/>
         <Setter Property="BorderBrush" Value="{DynamicResource BorderBrush}"/>
         <Setter Property="Foreground" Value="{DynamicResource PrimaryTextBrush}"/>
         <Setter Property="BorderThickness" Value="1"/>

src/Shared/HandyControl_Shared/Themes/Styles/Base/RadioGroupBaseStyle.xaml

@@ -13,7 +13,7 @@
     <Style x:Key="RadioGroupBaseStyle" TargetType="controls:RadioGroup">
         <Setter Property="ItemsPanel" Value="{StaticResource RadioGroupHorizontalItemsPanelTemplate}"/>
         <Setter Property="controls:TitleElement.BorderBrush" Value="{DynamicResource PrimaryBrush}"/>
-        <Setter Property="controls:TitleElement.Background" Value="{DynamicResource DefaultBrush}"/>
+        <Setter Property="controls:TitleElement.Background" Value="{DynamicResource RegionBrush}"/>
         <Setter Property="controls:TitleElement.Foreground" Value="{DynamicResource PrimaryBrush}"/>
         <Style.Triggers>
             <Trigger Property="Orientation" Value="Vertical">

src/Shared/HandyControl_Shared/Themes/Styles/Base/TransferBaseStyle.xaml

@@ -65,7 +65,7 @@
 
     <Style x:Key="TransferGroupBaseStyle" TargetType="controls:TransferGroup">
         <Setter Property="BorderThickness" Value="0"/>
-        <Setter Property="Background" Value="{DynamicResource DarkDefaultBrush}"/>
+        <Setter Property="Background" Value="{DynamicResource SecondaryRegionBrush}"/>
         <Setter Property="BorderBrush" Value="{DynamicResource BorderBrush}"/>
         <Setter Property="Template">
             <Setter.Value>