Silverlight - Help with Threading

I am trying to learn more about Silverlight. One thing I am trying to do is to call/invoke the UI thread from another thread I have started. In a WinForms app, I have done this using an Interface and Delegates. The Dispatcher in Silverlight seems to be close to what I've done before, but I cannot figure out how to invoke the dispatcher from the non-UI thread. Attached is a sample project I've started. I need for someone to use this project, and complete what I'm trying to do. I am not looking for someone to re-write the app. I just need for someone to show me how to accomplish the following, using my attached project: 1. Text Box and Button on the MainPage 2. Clicking Button starts a new thread 3. New thread will create some string value to be passed back to the UI thread 4. UI thread will receive the string value, and write it to the Text Box ## Deliverables Solution must be developed using: .Net Framework 4.0 Visual Studio 2010 Silverlight 4 Visual Basic .Net 4.0