no-display XAML

[Complete]

I have inherited source code from a project.

I am trying to decypher how it all fits together. It uses XAML. The problem is that when I open the XAML files Visual Studio 2008 does not display it graphically, and when it shows the file in text form, many of the elements seem to be undefined like "UserDefined" and "Grid". I thought that if I install Expression Blend, it will have these elements defined. But this did not work. Any ideas?

[Andre S. Veteran]

What version of .NET does it target? VS2008 does not support .NET 4. Otherwise check that the project includes the correct references (PresentationCore, PresentationFramework, System.Xaml, WindowsBase).