Use selectedChild property
<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"> <mx:Accordion id="accordion1" height="450"> <mx:Form id="shippingAddress" label="Address"> <mx:FormItem id="sfirstNameItem" label="First Name"> <mx:TextInput id="sfirstName" /> </mx:FormItem> </mx:Form> <mx:Form id="billingAddress" label="Address"> </mx:Form> <mx:Form id="creditCardInfo" label="Information"> </mx:Form> <mx:Form id="submitOrder" label="Submit"> <mx:Button id="nextButton" label="Next" click="accordion1.selectedChild=creditCardInfo;" /> </mx:Form> </mx:Accordion> </mx:Application>