Probably all three, but not intentionally. There is a lot of traffic and we
occasionally miss things.
There is work going on for a new component that extends Spark DataGrid and
supports hierarchy. The plan is to ship it in 2011, but it may not be
called AdvancedDataGrid. Some MX ADG stuff like multi-column sorting is
already in the current Spark DataGrid.
Please file a bug with your test case where Spark DataGrid hangs when
I'm not sure I get how you can extrapolate from a memory profiler result to
performance results. We know the Spark framework is a bit more expensive,
but we have test cases where Spark DataGrid outperforms the MX DataGrid.