Silverlight project modified in Blend cannot be built in a different computer with Visual Studio

I have installed Expression 4 and Visual Studio in my computer. A coworker is in charge of building and deploying. The thing is that he doesn't have Expression installed and now we have problems building the project in his computer. Is there an add-in fo开发者_如何学Gor visual studio to keep developers and designers working together without having to install Expression on every computer?

They need to install the Microsoft Expression Blend Software Development Kit (SDK) for Silverlight 4