I assume that there is an easier way than this; however, I did not have much luck. So, you can create a custom tooltip and use it. Just listen for your roll over/roll out and it will display. Using the sample code from the flex api samples page you can add this:   import mx.controls.ToolTip;  
                                import mx.managers.ToolTipManager;
   
   private  var customToolTip:ToolTip;
   
   protected function map_loadHandler(event:MapEvent):void
   {
    //map.addEventListener(FlareMouseEvent.FLARE_CLICK, flareClickHandler);    
    map.addEventListener(FlareEvent.FLARE_IN_START, flareInStartHandler);    
    addEventListener(FlareMouseEvent.FLARE_OUT, rollOutHandler);
    map.addEventListener(FlareMouseEvent.FLARE_OVER, rollOverHandler);
    
   }
   private function showCustomToolTip(gr:Graphic, stagex:Number, stagey:Number):void
   {
    customToolTip = ToolTipManager.createToolTip(gr.attributes.CITY_NAME,stagex,stagey) as ToolTip;
    
   }
   protected function rollOverHandler(event:FlareMouseEvent):void
   {
    removeEventListener(FlareMouseEvent.FLARE_OVER, rollOverHandler);
    showCustomToolTip(event.graphic, event.stageX, event.stageY);
    
   }
   protected function rollOutHandler(event:FlareMouseEvent):void
   {   
    ToolTipManager.destroyToolTip(customToolTip); 
   }You will need to play around with the listeners if you want a roll over and click, but this might get you moving in the right direction.