AS 3 DataGrid Component - no rollovers!

Hi,

I am working in flash 9 AS3 with the datagrid component. What I need is a command that turns off the rollover function of the datagrid. By default when you render the datagrid and rollover it you get a blue highlight of the data you are over. I want to turn this off because it is affecting the performance of my flash app!
Is there a way to do this?

Thanks,

waffe