fix: fix #53.

demo/Ursa.Demo/Pages/IPv4BoxDemo.axaml

@@ -4,14 +4,13 @@
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-    xmlns:pages="clr-namespace:Ursa.Demo.Pages"
     xmlns:u="https://irihi.tech/ursa"
+    xmlns:vm="clr-namespace:Ursa.Demo.ViewModels;assembly=Ursa.Demo"
+    x:DataType="vm:IPv4BoxDemoViewModel"
+    x:CompileBindings="True"
     d:DesignHeight="450"
     d:DesignWidth="800"
     mc:Ignorable="d">
-    <Design.DataContext>
-        <pages:IPv4DemoViewMode />
-    </Design.DataContext>
     <StackPanel HorizontalAlignment="Left">
         <ToggleButton
             Name="format"
@@ -38,6 +37,6 @@
             IPAddress="{Binding Address}"
             ShowLeadingZero="{Binding #format.IsChecked}" />
         <TextBlock Classes="" Text="Disabled" />
-        <u:IPv4Box Width="200" IsEnabled="False" />
+        <u:IPv4Box Width="200" IsEnabled="False" IPAddress="{Binding Address}" />
     </StackPanel>
 </UserControl>