Get current tooltip
<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" initialize="initApp()"> <mx:Script> import mx.managers.ToolTipManager; import mx.controls.ToolTip; import mx.events.ToolTipEvent; public function initApp():void { b1.addEventListener(ToolTipEvent.TOOL_TIP_SHOW, myToolTipChanger) } public function myToolTipChanger(event:ToolTipEvent):void { ToolTipManager.currentToolTip.text = "Click the button, " + Application.application.parameters.myName; } </mx:Script> <mx:Button id="b1" label="Click Me" toolTip="Click the button"/> </mx:Application>