[Flashcoders] Flex charting and canceling

[Ricky Bacon]

My Google-fu is failing me here.  I'm trying to cancel tool tips on a 
scatter plot using the Flex charting components.  When there are a 
cluster of items, I only want the first tool tip window to display 
instead of all of them.  Attempts like:

private function _chartItemRollOverHandler(event:ChartItemEvent):void {
        if(event.hitSet.length > 1) {
                for(var i:int = 1; i < event.hitSet.length; ++i) {
                        var hitData:HitData     = event.hitSet[i] as HitData;
                        hitData.chartItem.itemRenderer.visible  = false;
                }
        }
}
Have been unsuccessful.  Any suggestions on where I should look?

thanks

-Ricky
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