I see that the Subtotal, Tax Item, and Total properly update after the estimate is saved (but not after the grid is updated). I found the actions in the save button that perform the save and update of fields. I suppose I could call the save button action set if I want the grid update to also save all sections and update the fields.
One question, does the update of the grid change the Subtotal, Tax Item, and Total in the database? Then I could simply update the fields after the grid update. I will experiment a bit.