Refresh databinding for .rdlc?

Question

Hello, all,
I am having trouble with an issue in an RDLC file.  I had to modify the data source it was based on (add a field) and I need to access the new field from the RDLC.  The report is complicated and I really don't want to rebuild it, but there doesn't seem to be any way to rebind it to the data set.  How is this accomplished?
 
Thanks!