This is still an open issue for this new application, so thank you for your patience
I tried to have my Save button refresh panelMatRow (which is inside the repeat) but that didn't work. So, I also tried refreshing panelMatCostData (which contains the repeat) but that didn't work either. I also tried having the Save button perform a full refresh, but still no dice. While I had the page in my browser, I clicked on the url refresh indicator, too, but no luck.
I also added a view.refresh to the Save button, thinking the index needed to be updated as well, but that didn't help either.
I need to have the documents in the repeat control basically rebind themselves in order to get the updated values from the backend documents.
Howard's suggestion was a good one, however, it only updated the current row (doc). I need to update all the other rows (docs) as well.