Well, the datagrid class IS covered by the Flex migration doc, but there are some mistakes.
In AS2 there was an event on DataGrid, DataGrid.cellEdit (Broadcast when the cell value has changed).
There’s no cellBeginEdit or cellEndEdit although the migration doc lists these as AS2 events and then says they’ve been changed to itemEditBegin and itemEditEnd. What it should say is that cellEdit has been removed and replaced by these three events:
itemEditBegin
itemEditEnd
itemEditBeginning
For more details see the Flex 2 Language reference…