To make things even more complicated, this (editable)
DataGrid is in a popup window, heh.
None of the examples I've found so far seem to be working - I
might have to do the validation feedback (those little error
message popups on mouseover, and the red borders) on a per-cell
Needless to say that'll take a little time as I search
through the Flex SDK code to determine what I need to do... any
other options? Hints? Solutions? =)