Enable tooltip with ToolTipManager
<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"> <mx:Script> import mx.managers.ToolTipManager; </mx:Script> <mx:Button label="Enable ToolTips" click="ToolTipManager.enabled = true" toolTip="ToolTips enabled" /> <mx:Button label="Disable ToolTips" click="ToolTipManager.enabled = false" /> </mx:Application>