diff --git a/src/Semi.Avalonia/Controls/Expander.axaml b/src/Semi.Avalonia/Controls/Expander.axaml
index a7aea15..b151aba 100644
--- a/src/Semi.Avalonia/Controls/Expander.axaml
+++ b/src/Semi.Avalonia/Controls/Expander.axaml
@@ -9,7 +9,7 @@
         </StackPanel>
     </Design.PreviewWith>
     <ControlTheme x:Key="ExpanderHeaderToggleButtonTheme" TargetType="ToggleButton">
-        <Setter Property="ToggleButton.Template">
+        <Setter Property="Template">
             <ControlTemplate TargetType="ToggleButton">
                 <ContentPresenter
                     Padding="{TemplateBinding Padding}"
@@ -19,13 +19,13 @@
         </Setter>
     </ControlTheme>
     <ControlTheme x:Key="{x:Type Expander}" TargetType="Expander">
-        <Setter Property="Expander.BorderThickness" Value="1" />
-        <Setter Property="Expander.BorderBrush" Value="{DynamicResource ExpanderSeparatorBorderBrush}" />
-        <Setter Property="Expander.CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
-        <Setter Property="Expander.HorizontalAlignment" Value="Stretch" />
-        <Setter Property="Expander.HorizontalContentAlignment" Value="Stretch" />
-        <Setter Property="Expander.VerticalContentAlignment" Value="Stretch" />
-        <Setter Property="Expander.Template">
+        <Setter Property="BorderThickness" Value="1" />
+        <Setter Property="BorderBrush" Value="{DynamicResource ExpanderSeparatorBorderBrush}" />
+        <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
+        <Setter Property="HorizontalAlignment" Value="Stretch" />
+        <Setter Property="HorizontalContentAlignment" Value="Stretch" />
+        <Setter Property="VerticalContentAlignment" Value="Stretch" />
+        <Setter Property="Template">
             <ControlTemplate TargetType="Expander">
                 <DockPanel>
                     <LayoutTransformControl x:Name="ExpanderHeaderLayoutContainer" Margin="{DynamicResource ExpanderHeaderMargin}">
@@ -37,8 +37,7 @@
                             Background="{DynamicResource ExpanderHeaderDefaultBackground}"
                             BorderBrush="{TemplateBinding BorderBrush}"
                             BorderThickness="{TemplateBinding BorderThickness}"
-                            IsChecked="{TemplateBinding IsExpanded,
-                                                        Mode=TwoWay}"
+                            IsChecked="{TemplateBinding IsExpanded, Mode=TwoWay}"
                             IsEnabled="{TemplateBinding IsEnabled}"
                             TextElement.FontWeight="{DynamicResource ExpanderHeaderFontWeight}"
                             TextElement.Foreground="{DynamicResource ExpanderHeaderForeground}"
@@ -77,8 +76,7 @@
                                 Content="{TemplateBinding Content}"
                                 ContentTemplate="{TemplateBinding ContentTemplate}"
                                 Foreground="{DynamicResource ExpanderContentForeground}"
-                                IsVisible="{TemplateBinding IsExpanded,
-                                                            Mode=TwoWay}" />
+                                IsVisible="{TemplateBinding IsExpanded, Mode=TwoWay}" />
                         </Border>
                     </LayoutTransformControl>
                 </DockPanel>
diff --git a/src/Semi.Avalonia/Controls/GridSplitter.axaml b/src/Semi.Avalonia/Controls/GridSplitter.axaml
index 0748fa6..cbb9414 100644
--- a/src/Semi.Avalonia/Controls/GridSplitter.axaml
+++ b/src/Semi.Avalonia/Controls/GridSplitter.axaml
@@ -6,8 +6,8 @@
         <Setter Property="Focusable" Value="True" />
         <Setter Property="MinWidth" Value="6" />
         <Setter Property="MinHeight" Value="6" />
-        <Setter Property="GridSplitter.ClipToBounds" Value="False" />
-        <Setter Property="GridSplitter.Padding" Value="2" />
+        <Setter Property="ClipToBounds" Value="False" />
+        <Setter Property="Padding" Value="2" />
         <Setter Property="Background" Value="{DynamicResource GridSplitterBackground}" />
         <Setter Property="PreviewContent">
             <Template>
diff --git a/src/Semi.Avalonia/Themes/HighContrast/Base.axaml b/src/Semi.Avalonia/Themes/HighContrast/Base.axaml
index 9d4c00c..e82271d 100644
--- a/src/Semi.Avalonia/Themes/HighContrast/Base.axaml
+++ b/src/Semi.Avalonia/Themes/HighContrast/Base.axaml
@@ -219,11 +219,11 @@
     <SolidColorBrush x:Key="DateTimePickerButtonDisabledIconForeground" Color="{StaticResource GrayTextColor}" />
 
     <!-- Expander -->
-    <SolidColorBrush x:Key="ExpanderSeparatorBorderBrush" Color="{StaticResource WindowTextColor}" />
-    <SolidColorBrush x:Key="ExpanderHeaderForeground" Color="{StaticResource WindowTextColor}" />
+    <SolidColorBrush x:Key="ExpanderSeparatorBorderBrush" Color="{StaticResource ButtonTextColor}" />
+    <SolidColorBrush x:Key="ExpanderHeaderForeground" Color="{StaticResource ButtonTextColor}" />
     <SolidColorBrush x:Key="ExpanderHeaderDisabledForeground" Color="{StaticResource GrayTextColor}" />
     <SolidColorBrush x:Key="ExpanderHeaderDefaultBackground" Color="{StaticResource WindowColor}" />
-    <SolidColorBrush x:Key="ExpanderHeaderHoverBackground" Color="{StaticResource WindowColor}" />
+    <SolidColorBrush x:Key="ExpanderHeaderHoverBackground" Color="{StaticResource HighlightTextColor}" />
     <SolidColorBrush x:Key="ExpanderHeaderPressedBackground" Color="{StaticResource WindowColor}" />
     <SolidColorBrush x:Key="ExpanderContentForeground" Color="{StaticResource WindowTextColor}" />