+1  A: 

You might want to check out this component: http://code.google.com/p/flex-spreadsheet/

Luis B
+1  A: 

Another solution that I just found to this type of problem is the following

here is the demo:
http://blogs.adobe.com/aharui/SplitColumns/dg.swf

here is the discussion:
http://blogs.adobe.com/aharui/2007/03/thinking%5Fabout%5Fitem%5Frenderers%5F1.html

Luis B