diff --git a/src/Semi.Avalonia.Demo/Pages/ComboBoxDemo.axaml b/src/Semi.Avalonia.Demo/Pages/ComboBoxDemo.axaml
index 9c3c32c..bc2a376 100644
--- a/src/Semi.Avalonia.Demo/Pages/ComboBoxDemo.axaml
+++ b/src/Semi.Avalonia.Demo/Pages/ComboBoxDemo.axaml
@@ -13,5 +13,15 @@
             <TextBlock>BBB</TextBlock>
             <TextBlock>CCC</TextBlock>
         </ComboBox>
+        <ComboBox Width="150" PlaceholderText="Please Select">
+            <TextBlock>AAA</TextBlock>
+            <TextBlock>BBB</TextBlock>
+            <TextBlock>CCC</TextBlock>
+        </ComboBox>
+        <ComboBox Width="150" IsEnabled="False">
+            <TextBlock>AAA</TextBlock>
+            <TextBlock>BBB</TextBlock>
+            <TextBlock>CCC</TextBlock>
+        </ComboBox>
     </StackPanel>
 </UserControl>