[flexcoders] is there a way to restrict height of a TileGroup?

[mark.embrey]

I have a TileGroup with the following properties:

requestedColumnCount="3" requestedRowCount="3"

As I add more items to the TileGroup I get more than 3 rows (though, for some 
reason, columns remain unchanged).

Is there a way to make this behave like a List and cause it to scroll if the 
row count is greater than three?

thanks,

Mark