Add SolutionFolder with editable label.

Hi,

I create new solution folder using this code: 

EnvDTE80.Solution2 solution = item.Object as EnvDTE80.Solution2;

if (solution != null)
{
	EnvDTE.Project folder = solution.AddSolutionFolder("NewFolder");

	return null;
}

But if i want to create two folders I have some error. How can i create SolutionFolder and rename it.

Thanks.