如何与设计器和Expression Blend共享WPF XAML文件？

I am trying to get my designer to update our xaml files with a better look and feel. I was hoping to give her just the xaml file and Expression Blend and let her go wild with it, but now I notice that Expression Blend does not seem to have any way of opening an actual xaml file by itself but is expecting a whole project.I am trying to get my designer to update our xa