Commented Unassigned: Cannot resolve Regions in XAML [10343]

I added http://www.codeplex.com/prism namespace to my XAML. It could not be found by intellisense but VS seemed to be happy with it manually added. When I try to add a region, I get an error "The name "RegionManager" does not exist in the namespace "http://www.codeplex.com/prism". I have not run into any issues with basic c# code, just in XAML.

I downloaded and am using Prism 4.1 against .NET 4.5 in VS 2012.

Is this a bug or am I missing something?

Relevant Code:
xmlns:prism="http://www.codeplex.com/prism"

prism:RegionManager.RegionName="{x:Static infran:RegionNames.AlertRegion}"
Comments: ** Comment from web user: DCherubini **

Attachment deleted.

I'm glad we could help you solve this problem.
As the issue is now solved we will close this work item.

If you need any further support regarding this or other topics, you can create a new thread in the [discussion section](https://compositewpf.codeplex.com/discussions) where we will try to help with your concerns.

Thanks,

Damian Cherubini
http://blogs.southworks.net/dcherubini