Jumping to next control through pressing ENTER key from keyb

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:Label x="8" y="18" text="First Name:" fontWeight="bold"/>
<mx:TextInput x="95" y="14" tabIndex="1" keyDown="enterCheck(event,'1')" id="txtfn"/>
<mx:Label x="8" y="48" text="Second Name:" fontWeight="bold"/>
<mx:TextInput x="95" y="44" tabIndex="2" keyDown="enterCheck(event,'2')" id="txtsn"/>
<mx:Label x="8" y="78" text="Last Name:" fontWeight="bold"/>
<mx:TextInput x="95" y="74" tabIndex="3" keyDown="enterCheck(event,'3')" id="txtln"/>
<mx:Label x="8" y="108" text="Designation:" fontWeight="bold"/>
<mx:TextInput x="95" y="104" tabIndex="4" keyDown="enterCheck(event,'4')" id="txtd"/>
<mx:Label x="8" y="138" text="Address:" fontWeight="bold"/>
<mx:TextInput x="95" y="134" tabIndex="5" keyDown="enterCheck(event,'5')" id="txta"/>
<mx:Script>
<![CDATA[
import mx.controls.Alert;
private function enterCheck(event:KeyboardEvent, ind:String):void
{

if (event.keyCode == Keyboard.ENTER)
{
if (ind == '1')
{
txtsn.setFocus();
}
if (ind == '2')
{
txtln.setFocus();
}
if (ind == '3')
{
txtd.setFocus();
}
if (ind == '4')
{
txta.setFocus();
}
if (ind == '5')
{
txtfn.setFocus();
}
}
}
]]>
</mx:Script>
</mx:Application>

i want such technique in which no need to mention the id of next control,on pressing "Enter" control automatically go to next tab.

<?xml version="1.0" encoding="utf-8"?>
<mx:Panel xmlns:mx="http://www.adobe.com/2006/mxml" width="650" height="300" layout="absolute">
<mx:Script>
<![CDATA[
import mx.controls.TextInput;
import mx.events.FlexEvent;

protected function textinput_enterHandler(event:FlexEvent):void
{

var currentObj:Object = event.currentTarget;
var i:int;
for(i = (this.getChildIndex(currentObj as DisplayObject)+1); i<this.getChildren().length; i++)
{
if((this.getChildIndex(currentObj as DisplayObject)+1) < this.getChildren().length)
{
if((this.getChildAt(this.getChildIndex(currentObj as DisplayObject)+1)as TextInput)!=null)
{
(this.getChildAt(this.getChildIndex(currentObj as DisplayObject)+1)as TextInput ).setFocus();
break;
}else
{
currentObj = this.getChildAt(i);
continue;
}
}
}
}

]]>
</mx:Script>

<mx:Label x="76" y="23" text="label 1" height="20"/>
<mx:TextInput enter="textinput_enterHandler(event)" x="127" y="21"/>
<mx:Label x="76" y="53" text="label 2" height="20"/>

<mx:TextInput enter="textinput_enterHandler(event)" x="127" y="51"/>
<mx:CheckBox x="295" y="21" label="Checkbox"/>
<mx:Label x="76" y="83" text="label 3" height="20"/>
<mx:TextInput enter="textinput_enterHandler(event)" x="127" y="81"/>
<mx:TextInput enter="textinput_enterHandler(event)" x="127" y="111"/>
<mx:TextInput enter="textinput_enterHandler(event)" x="127" y="141"/>
<mx:TextInput enter="textinput_enterHandler(event)" x="127" y="171"/>
<mx:TextInput enter="textinput_enterHandler(event)" x="127" y="201"/>
<mx:DateField x="295" y="51"/>
<mx:RadioButton x="295" y="81" label="Radio"/>

</mx:Panel>