protected override void OnWriteProject (ProgressMonitor monitor, MonoDevelop.Projects.MSBuild.MSBuildProject msproject)
		{
			if (projItemsPath == FilePath.Null)
				projItemsPath = Path.ChangeExtension (FileName, ".projitems");

			if (projitemsProject == null) {
				projitemsProject = new MSBuildProject (msproject.EngineManager);
				projitemsProject.FileName = projItemsPath;
				var grp = projitemsProject.GetGlobalPropertyGroup ();
				if (grp == null)
					grp = projitemsProject.AddNewPropertyGroup (false);
				grp.SetValue ("MSBuildAllProjects", "$(MSBuildAllProjects);$(MSBuildThisFileFullPath)");
				grp.SetValue ("HasSharedItems", true);
				grp.SetValue ("SharedGUID", ItemId, preserveExistingCase:true);
			}

			IMSBuildPropertySet configGrp = projitemsProject.PropertyGroups.FirstOrDefault (g => g.Label == "Configuration");
			if (configGrp == null) {
				configGrp = projitemsProject.AddNewPropertyGroup (true);
				configGrp.Label = "Configuration";
			}
			configGrp.SetValue ("Import_RootNamespace", DefaultNamespace);

			base.OnWriteProject (monitor, msproject);

			var newProject = FileName == null || projitemsProject.IsNewProject;
			if (newProject) {
				var grp = msproject.GetGlobalPropertyGroup ();
				if (grp == null)
					grp = msproject.AddNewPropertyGroup (false);
				grp.SetValue ("ProjectGuid", ItemId, preserveExistingCase:true);
				var import = msproject.AddNewImport (@"$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props");
				import.Condition = @"Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')";
				msproject.AddNewImport (@"$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)\CodeSharing\Microsoft.CodeSharing.Common.Default.props");
				msproject.AddNewImport (@"$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)\CodeSharing\Microsoft.CodeSharing.Common.props");
				import = msproject.AddNewImport (MSBuildProjectService.ToMSBuildPath (FileName.ParentDirectory, projItemsPath));
				import.Label = "Shared";
				if (LanguageName.Equals("C#", StringComparison.OrdinalIgnoreCase)) {
					msproject.AddNewImport (CSharptargets);
				}
				else if (LanguageName.Equals("F#", StringComparison.OrdinalIgnoreCase)) {
					msproject.AddNewImport (FSharptargets);
				}

			} else {
				var itemsImport = msproject.Imports.FirstOrDefault (i => i.Label == "Shared");
				if (itemsImport != null)
					itemsImport.Project = MSBuildProjectService.ToMSBuildPath (FileName.ParentDirectory, projItemsPath);
				else {
					var import = msproject.AddNewImport (MSBuildProjectService.ToMSBuildPath (FileName.ParentDirectory, projItemsPath));
					import.Label = "Shared";
				}
			}

			// having no ToolsVersion is equivalent to 2.0, roundtrip that correctly
			if (ToolsVersion != "2.0")
				msproject.ToolsVersion = ToolsVersion;
			else if (string.IsNullOrEmpty (msproject.ToolsVersion))
				msproject.ToolsVersion = null;
			else
				msproject.ToolsVersion = "2.0";

			projitemsProject.Save (projItemsPath);
		}