title: flex spark buttonbar : how to determine which button in mouseOver event
body: <p>re: <strong>spark.components.ButtonBar</strong></p>
  
  <p>In the spark ButtonBar's <strong>mouseOver</strong> event, how do you determine which of the several buttons the mouse is hovering over?  There is, of course, no selected index at this juncture.  If it makes a difference, my ButtonBar is not defined in MXML but is instantiated in ActionScript and an ArrayList is assigned to the  dataProvider property of my ButtonBar instance.</p>
  
  <p>Thanks for the  help.</p>