title: Flex: Add TOTAL column for AdvancedDataGridColumnGroup?
body: <p>I have an AdvancedDataGrid that has a couple AdvancedDataGridColumnGroup's I would like each group to have an extra column, that shows the total of all the other columns in the group. I also need to use my own calc function to calculate the totals. Is there anyway to do this? I hope I explained this well.</p>
  
  <p>Thanks!!</p>