Flex :: Triggering Function Event On Selecting A Row In An Advanced Data Grid

The Following code seems to only be working when i have editable="true" on the Advanced Data Grid. But I don't want it it be editable.

The docs don't say anything about it needing to be editable, and i dont see why it should need to be.

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a_data_list.addEventListener(AdvancedDataGridEvent.ITEM_FOCUS_IN, clickedRow);
public function clickedRow(event:AdvancedDataGridEvent):void
{
trace("datagrid line was clicked");
}