DTE.ProjectItem GetFirstChildItem(ProjectItems projectItems)
		{
			return projectItems.OfType<DTE.ProjectItem>().FirstOrDefault();
		}
		List<DTE.ProjectItem> GetAllChildItems(ProjectItems projectItems)
		{
			return projectItems.OfType<DTE.ProjectItem>().ToList();
		}
		DTE.ProjectItem GetChildItem(ProjectItems projectItems, string name)
		{
			return projectItems
				.OfType<DTE.ProjectItem>()
				.SingleOrDefault(item => item.Name == name);
		}