title: Datagrid, getting and setting individual cell values
body: <p>I have Flex 4 DataGrid, what I would like to do is when an cell has been edited,
  I would then like to walk through the values of that column and preform math on the values, eg I want to total up certain values.</p>
  
  <p>1) How do I reference individual values of a specific column so that I may set them.
  2) How do I then set those values or should I create a new column array and pop it in place of that column.</p>
  
  <p>Please and thank you in Advance.
  Craig</p>