diff -r 1df2fb3d079c -r c9b8b9e0cfe8 ui/wpf/UIcore/UIcore.csproj
--- a/ui/wpf/UIcore/UIcore.csproj	Sun Jan 22 18:02:45 2017 +0100
+++ b/ui/wpf/UIcore/UIcore.csproj	Mon Jan 23 10:50:22 2017 +0100
@@ -48,6 +48,7 @@
   <ItemGroup>
     <Compile Include="Container.cs" />
     <Compile Include="Controls.cs" />
+    <Compile Include="DrawingArea.cs" />
     <Compile Include="MainToolBar.cs" />
     <Compile Include="Menu.cs" />
     <Compile Include="TextArea.cs" />