Editing question

I have a Feature Class with 20 polygons in a grid square format. In our Flex Map Viewer, I would like to allow our users to click on a particular grid square, change a specific field value (in this case type in a date in a Date Field), and then have the grid square for which this value was changed turn a different color inside the Flex Map Viewer.

Is this possible to do from inside a Flex Viewer?

I am using Flex 3.0, if I were to do this do I need to upgrade to 3.4?

How would you recommend I do this? Is there a widget I can download and tweak a little bit?


thanks.