close #554

src/Net_40/HandyControl_Net_40/Themes/Theme.xaml

@@ -10032,6 +10032,9 @@
             <Trigger Property="IsSelected" Value="False">
               <Setter Property="BorderThickness" TargetName="mainBorder" Value="0,0,0,0" />
             </Trigger>
+            <Trigger Property="IsEnabled" Value="False">
+              <Setter Property="Opacity" Value="0.4" TargetName="contentPresenter" />
+            </Trigger>
             <MultiDataTrigger>
               <MultiDataTrigger.Conditions>
                 <Condition Binding="{Binding IsSelected, RelativeSource={RelativeSource Self}}" Value="true" />