Spark DataGrid scrollToIndex?

In Flex I used to use the dataGrid.scrollToIndex(XX) to scroll down to a selected row.

I can't seem to get anything to work for the Spark DataGrid in FB4.5.  Searching around I tried to impliment this:

dataGrid.ensureCellIsVisible(selectedSlideIndex);

dataGrid.setSelectedIndex(selectedSlideIndex);

The selectedSlideIndex is set when a row is selected to store the int.

I can't get the DataGrid to scroll to the index, OR select the index..

So what is the Spark DataGrid version of the MX DataGrid.scrollToIndex?