fixed #254

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

@@ -14,7 +14,7 @@
         <Setter Property="VerticalContentAlignment" Value="Center"/>
         <Setter Property="BorderBrush" Value="Transparent"/>
         <Setter Property="BorderThickness" Value="1"/>
-        <Setter Property="MinHeight" Value="32"/>
+        <Setter Property="MinHeight" Value="{StaticResource DefaultControlHeight}"/>
         <Setter Property="Template">
             <Setter.Value>
                 <ControlTemplate TargetType="Expander">