Windows Phone 7: Animation transitioning between pages?

I'm trying to figure out how to transition between pages. I've loo开发者_开发百科ked at a few blog posts. I downloaded a sample project from this blog. I pasted the mainFrameStyle into my App.xaml's ResourceDictionary. I added the following to the Application tag:

xmlns:layout="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Layout.Toolkit"

It complains about the TransitioningContentControltags:

The tag 'TransitioningContentControl' does not exist in XML namespace 'clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Layout.Toolkit'.  

What am I doing wrong? The blog post is from a few months back; perhaps something has changed now that I'm on the final version of the SDK?

That post also said that the wp7 SDK is based on SL 3, which surprised me. I thought it was SL 4?

Have you downloaded the Silverlight toolkit? silverlight.codeplex.com/.

1. Download and install the toolkit.
2. Add a reference in your project to System.Windows.Controls.Layout.Toolkit.dll (for example after installation, it was found in: Program Files (x86)\Microsoft SDKs\Silverlight\v4.0\Toolkit\Apr10\Bin\System.Windows.Controls.Layout.Toolk it.dll)

BEWARE: I have to say that this control isn't ready for prime time yet though. It seems to be a little buggy, and will crash if you navigate while a previous transition is running. For example if you go to a page and quickly navigate backwards.

some more implementation details that I wrote about a while back: http://cdn.microsoftplatformready.com/assets/PortingIPhoneToWindowsPhone7.pdf

The location of the Nov 2010 release is inside the windows phone folder and not silverlight folder.

C:\Program Files\Microsoft SDKs\Windows Phone\v7.0\Toolkit\Nov10\Bin