diff --git a/demo/Semi.Avalonia.Demo/Pages/Overview.axaml b/demo/Semi.Avalonia.Demo/Pages/Overview.axaml
index a2a8569..a236e88 100644
--- a/demo/Semi.Avalonia.Demo/Pages/Overview.axaml
+++ b/demo/Semi.Avalonia.Demo/Pages/Overview.axaml
@@ -96,7 +96,11 @@
                 </TabItem>
             </TabControl>
             <StackPanel Orientation="Horizontal" Spacing="20">
-                <ComboBox Width="200" PlaceholderText="Please Select" />
+                <ComboBox Width="200" PlaceholderText="Please Select" >
+                    <ComboBoxItem>Item 1</ComboBoxItem>
+                    <ComboBoxItem>Item 2</ComboBoxItem>
+                    <ComboBoxItem>Item 3</ComboBoxItem>
+                </ComboBox>
                 <DatePicker />
                 <TimePicker />
                 <CalendarDatePicker />
diff --git a/src/Semi.Avalonia/Themes/Dark/ComboBox.axaml b/src/Semi.Avalonia/Themes/Dark/ComboBox.axaml
index e0b90f4..9032829 100644
--- a/src/Semi.Avalonia/Themes/Dark/ComboBox.axaml
+++ b/src/Semi.Avalonia/Themes/Dark/ComboBox.axaml
@@ -39,8 +39,8 @@
     </PathGeometry>
 
     <x:Double x:Key="ComboBoxDefaultHeight">32</x:Double>
-    <x:Double x:Key="ComboBoxLargeHeight">24</x:Double>
-    <x:Double x:Key="ComboBoxSmallHeight">40</x:Double>
+    <x:Double x:Key="ComboBoxSmallHeight">24</x:Double>
+    <x:Double x:Key="ComboBoxLargeHeight">40</x:Double>
 
     <SolidColorBrush x:Key="ComboBoxSelectorBorderedBackground" Color="Transparent" />
     <SolidColorBrush x:Key="ComboBoxSelectorBorderedBorderBrush" Opacity="0.12" Color="White" />
diff --git a/src/Semi.Avalonia/Themes/Light/ComboBox.axaml b/src/Semi.Avalonia/Themes/Light/ComboBox.axaml
index 744aaf7..bfffc1a 100644
--- a/src/Semi.Avalonia/Themes/Light/ComboBox.axaml
+++ b/src/Semi.Avalonia/Themes/Light/ComboBox.axaml
@@ -39,8 +39,8 @@
     </PathGeometry>
 
     <x:Double x:Key="ComboBoxDefaultHeight">32</x:Double>
-    <x:Double x:Key="ComboBoxLargeHeight">24</x:Double>
-    <x:Double x:Key="ComboBoxSmallHeight">40</x:Double>
+    <x:Double x:Key="ComboBoxSmallHeight">24</x:Double>
+    <x:Double x:Key="ComboBoxLargeHeight">40</x:Double>
 
     <SolidColorBrush x:Key="ComboBoxSelectorBorderedBackground" Color="Transparent" />
     <SolidColorBrush x:Key="ComboBoxSelectorBorderedBorderBrush" Opacity="0.08" Color="#FF1C1F23" />