text: function setSize( evt, circleSize ) {
    var circle = evt.getTarget();
    circle.setAttribute( "r", circleSize );
  }
      
  function setLocation( evt, newX, newY ) {
    var circle = evt.getTarget();
    circle.setAttribute( "cx", newX );
    circle.setAttribute( "cy", newY );
  }
  
  function setStyle( evt, newStyle ) {
    var circle = evt.getTarget();
    circle.setAttribute( "style", newStyle );
  }