diff --git a/ICSharpCode.NRefactory.Demo/ICSharpCode.NRefactory.Demo.csproj b/ICSharpCode.NRefactory.Demo/ICSharpCode.NRefactory.Demo.csproj
index 36ea620c69..906a947738 100644
--- a/ICSharpCode.NRefactory.Demo/ICSharpCode.NRefactory.Demo.csproj
+++ b/ICSharpCode.NRefactory.Demo/ICSharpCode.NRefactory.Demo.csproj
@@ -40,21 +40,29 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
-    <Compile Include="VBEditDialog.cs" />
+    <Compile Include="VBEditDialog.cs">
+      <SubType>Form</SubType>
+    </Compile>
     <Compile Include="VBEditDialog.Designer.cs">
       <DependentUpon>VBEditDialog.cs</DependentUpon>
     </Compile>
-    <Compile Include="VBDomView.cs" />
+    <Compile Include="VBDomView.cs">
+      <SubType>UserControl</SubType>
+    </Compile>
     <Compile Include="VBDomView.Designer.cs">
       <DependentUpon>VBDomView.cs</DependentUpon>
     </Compile>
-    <Compile Include="MainForm.cs" />
+    <Compile Include="MainForm.cs">
+      <SubType>Form</SubType>
+    </Compile>
     <Compile Include="MainForm.Designer.cs">
       <DependentUpon>MainForm.cs</DependentUpon>
     </Compile>
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
-    <Compile Include="VBDemo.cs" />
+    <Compile Include="VBDemo.cs">
+      <SubType>UserControl</SubType>
+    </Compile>
     <Compile Include="VBDemo.Designer.cs">
       <DependentUpon>VBDemo.cs</DependentUpon>
     </Compile>