Windows store app prototyping

Question

I have looked around here and the Internet in general but it seems this question hasn't received any answers yet. So, are there any good prototyping tools targeted specifically at Windows store app applications? Any tool would do as long as it has W8Metro layouts and components.

Thanks

Answer 1

Microsoft has Expression Blend for prototyping, which is included in the Windows 8 development bundle.

Answer 2

Visual Studio 2012 you can do Storyboarding with PowerPoint. There's a gallery for controls, icons and stuff.