title: How to open Designer View in Visual C#?
body: <p>I got a project source codes developed by Visual C# 2012. I opened &amp; built it without any problem.
  Then, I would like to open its visual portions; such as forms, buttons, ... I clicked "View" menu, I found the menu items are 'Code', "Solution Explorer", "Team Explorer", "Server Explorer", ... The item 'Designer' is missing. How come? How can I open 'Designer' view window?</p>