The second version of the TreeGrid component is done. It is working much better thanks to comments from Matt and Jose. I was able to resolve all of the issues I was aware of except the hard coded reference to "product". I was even able to get recursion working. I think I may have to eventually extend DataGrid so that I can add column sorting. Here are the changes I would still like to make to it:
  
- Column sorting is currently disabled. I would like to make it work... Maybe it would just sort top level nodes. What do you all think?
  
- Column resizing does not clip the disclosure icon correctly. The Label gets clipped right, but not the icon. Any ideas?
  
- Any other ideas to make this better?

Well here it is:

[Here is the mxml code][1]
  
[Here is the cellRenderer code][2]

Please let me know your comments and suggestions.

-James

 [1]: http://www.cayambe.com/TreeGrid-v2/TreeGrid.mxml.txt
 [2]: http://www.cayambe.com/TreeGrid-v2/TreeGridCellRenderer.as