troubleshooting

What are the tools available for troubleshooting WPF and Silverlight Databinding issues?

In general, what are the best practices to debug a Silverlight or WPF application, especially when you get errors with Databinding? Are there free tools available? I am not getting any errors as such, but I am interested in figuring out the approaches that you take as Silverlight and WPF experts. Thanks! ...