DataGrid event, what was selected?

Hi,
I have a DataGrid in my scene and I've figured out how to
populate it with XML using AS3.
The only thing I can't figure out is to determine which
element has been clicked on.
It's not an editable grid, I just want to handle when someone
selects a row in the grid and display that rows elements.
Thanks for ANY help. I'm so close.
myDataGrid.addEventListener(SELECT, mySelectHandler);
returns the error...
ReferenceError: Error #1065: Variable SELECT is not defined.
myDataGrid.addEventListener(Event.CHANGE, mySelectHandler);
returns the error...
TypeError: Error #1034: Type Coercion failed: cannot convert
flash.events::Event@3aa94471 to fl.events.DataGridEvent.
at
flash.events::EventDispatcher/flash.events:EventDispatcher::dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at
fl.controls::SelectableList/fl.controls:SelectableList::handleCellRendererClick()
at
fl.controls::DataGrid/fl.controls:DataGrid::handleCellRendererClick()

Both DataGrid.click and DataGrid.itemClick return this
error...Parameter type must be non-null.
There is no click or itemClick event for DataGrid, is there
some way to bubble it up from underlying class?
It seems like such a simple thing, I can't understand why
click isn't an event that can be monitored in DataGrid. Must be
something simple I'm doing wrong.
TypeError: Error #2007: Parameter type must be non-null.
at flash.events::EventDispatcher/addEventListener()
at test6_fla::MainTimeline/ParseRooms()
at test6_fla::MainTimeline/LoadXML()
at
flash.events::EventDispatcher/flash.events:EventDispatcher::dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at
flash.net::URLLoader/flash.net:URLLoader::onComplete()

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