diff --git a/demo/Semi.Avalonia.Demo/Pages/ComboBoxDemo.axaml b/demo/Semi.Avalonia.Demo/Pages/ComboBoxDemo.axaml
index eca2b5e..df5a595 100644
--- a/demo/Semi.Avalonia.Demo/Pages/ComboBoxDemo.axaml
+++ b/demo/Semi.Avalonia.Demo/Pages/ComboBoxDemo.axaml
@@ -9,19 +9,19 @@
     mc:Ignorable="d">
     <StackPanel Spacing="20">
         <ComboBox Width="150">
-            <TextBlock>AAA</TextBlock>
-            <TextBlock>BBB</TextBlock>
-            <TextBlock>CCC</TextBlock>
+            <ComboBoxItem>AAA</ComboBoxItem>
+            <ComboBoxItem>BBB</ComboBoxItem>
+            <ComboBoxItem>CCC</ComboBoxItem>
         </ComboBox>
         <ComboBox Width="150" PlaceholderText="Please Select">
-            <TextBlock>AAA</TextBlock>
-            <TextBlock>BBB</TextBlock>
-            <TextBlock>CCC</TextBlock>
+            <ComboBoxItem>AAA</ComboBoxItem>
+            <ComboBoxItem>BBB</ComboBoxItem>
+            <ComboBoxItem>CCC</ComboBoxItem>
         </ComboBox>
         <ComboBox Width="150" IsEnabled="False">
-            <TextBlock>AAA</TextBlock>
-            <TextBlock>BBB</TextBlock>
-            <TextBlock>CCC</TextBlock>
+            <ComboBoxItem>AAA</ComboBoxItem>
+            <ComboBoxItem>BBB</ComboBoxItem>
+            <ComboBoxItem>CCC</ComboBoxItem>
         </ComboBox>
     </StackPanel>
 </UserControl>