misc: change project file.

Ursa.sln

@@ -6,6 +6,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ursa.Demo", "demo\Ursa.Demo
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ursa.Themes.Semi", "src\Ursa.Themes.Semi\Ursa.Themes.Semi.csproj", "{53B5F277-3AEB-4661-ACAE-15CFFF2ED800}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Demo", "Demo", "{A41BAF0D-DA61-4A63-889A-084BAD36FD66}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -25,4 +27,7 @@ Global
 		{53B5F277-3AEB-4661-ACAE-15CFFF2ED800}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{53B5F277-3AEB-4661-ACAE-15CFFF2ED800}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
+	GlobalSection(NestedProjects) = preSolution
+		{407A91FD-A88B-459B-8DCE-8C6AA98279FE} = {A41BAF0D-DA61-4A63-889A-084BAD36FD66}
+	EndGlobalSection
 EndGlobal

demo/Ursa.Demo/Views/MainWindow.axaml

@@ -15,7 +15,7 @@
         <vm:MainWindowViewModel />
     </Design.DataContext>
 
-    <StackPanel Spacing="20">
+    <StackPanel HorizontalAlignment="Left" Spacing="20">
         <TextBlock
             HorizontalAlignment="Center"
             VerticalAlignment="Center"

src/Ursa.Themes.Semi/Class1.cs

@@ -1,5 +0,0 @@
-namespace Ursa.Themes.Semi;
-
-public class Class1
-{
-}

src/Ursa.Themes.Semi/Ursa.Themes.Semi.csproj

@@ -15,4 +15,8 @@
       <ProjectReference Include="..\Ursa\Ursa.csproj" />
     </ItemGroup>
 
+    <ItemGroup>
+      <Folder Include="Controls" />
+    </ItemGroup>
+
 </Project>

src/Ursa/Class1.cs

@@ -1,5 +0,0 @@
-namespace Ursa;
-
-public class Class1
-{
-}

src/Ursa/Ursa.csproj

@@ -11,4 +11,8 @@
       <PackageReference Include="XamlNameReferenceGenerator" Version="1.5.1" />
     </ItemGroup>
 
+    <ItemGroup>
+      <Folder Include="Controls\Menu" />
+    </ItemGroup>
+
 </Project>