Here's a link to an article that shows a few different ways to show VIEW code. Hope this helps.
Basically, (as @Martin Smith mentioned) you can do a "exec sp_helptext [view_name]"; obviously exchanging [view_name] with the name of your view.
From with SQL Server Management Studio, you can locate the view in the "views" node, right-click on it, and obtain the code behind it by clicking "CREATE TO" and then a location.
Lastly, you can run the following SQL against INFORMATION_SCHEMA.Views:
SELECT TABLE_NAME as ViewName, VIEW_DEFINITION as ViewDefinition
Of course, given the limit of 4000 characters, a better option would be:
SELECT name, object_definition(object_id)
WHERE [type] 'v'