diff --git a/demo/Ursa.Demo/Pages/NumericUpDownDemo.axaml b/demo/Ursa.Demo/Pages/NumericUpDownDemo.axaml
index 51d5a89..5a0f79c 100644
--- a/demo/Ursa.Demo/Pages/NumericUpDownDemo.axaml
+++ b/demo/Ursa.Demo/Pages/NumericUpDownDemo.axaml
@@ -25,12 +25,12 @@
             <u:Divider Content="Change Right -&gt;" />
             <u:NumericUIntUpDown
                 Name="numd"
-                Command="{Binding TrythisCommand}"
                 Width="{Binding Width}"
                 HorizontalAlignment="{Binding HorizontalAlignment}"
                 HorizontalContentAlignment="{Binding HorizontalContentAlignment}"
                 AllowDrag="{Binding AllowDrag}"
                 AllowSpin="{Binding AllowSpin}"
+                Command="{Binding TrythisCommand}"
                 FontFamily="{Binding FontFamily, Mode=OneWay}"
                 FormatString="{Binding FormatString}"
                 InnerLeftContent="{Binding InnerLeftContent}"
@@ -43,6 +43,11 @@
                 Step="{Binding Step}"
                 Watermark="{Binding Watermark}"
                 Value="{Binding Value}" />
+            <TextBox
+                Width="NaN"
+                HorizontalAlignment="Center"
+                IsReadOnly="true"
+                Text="{Binding CommandUpdateText}" />
             <u:Divider Content="Demo" />
         </StackPanel>
 
diff --git a/demo/Ursa.Demo/ViewModels/NumericUpDownDemoViewModel.cs b/demo/Ursa.Demo/ViewModels/NumericUpDownDemoViewModel.cs
index a533528..663b5f1 100644
--- a/demo/Ursa.Demo/ViewModels/NumericUpDownDemoViewModel.cs
+++ b/demo/Ursa.Demo/ViewModels/NumericUpDownDemoViewModel.cs
@@ -40,13 +40,15 @@ public partial class NumericUpDownDemoViewModel : ObservableObject
 
     [ObservableProperty] private bool _IsEnable = true;
 
+    [ObservableProperty] private string _CommandUpdateText = "Command not Execute";
+
     uint v = 0;
     [RelayCommand]
     // void Trythis()
     void Trythis(uint v)
     // void Trythis(object v)
     {
-        System.Diagnostics.Trace.WriteLine(v);
+        CommandUpdateText = $"Command Exe,CommandParameter={v}";
     }