如何在执行时使React JS单击处理程序更新DOM？

I am in the final stages of finishing a demo app using React JS, rendering data in a table. When you hover over an item in the status column, a popup div appears and you can click on one of 3 options in a list. Once one of the items is clicked, I am able to get the click handler to run, but I can't figure out how to cause the DOM to change to show the newly clicked Status and to change the Update field with a new, current, date. I am in the final stages of finishing a demo ap