InfoPath Dev

I have a Infopath  form with a drop down list "suppliers", wich is popullated by a SharePoint list. How can I refresh the drop down list, after a new entrie in the SharePoint list without first closing the form?  

I would just add a button to the form that queries the data source for the dropdown - then if the user has the form open, and adds a supplier to the list, they can click the "refresh" button, which queries the data source, and then returns the new entry.

 That works, thanks!!