[flexcoders] Problems with setFocus()

[pande2901]

I have the following code as my MXML code 
<mx:TextInput id="firstInput" focusOut="validateField(event)"/> 
<mx:TextInput id="secondInput" /> 

The script getting called is given below: 
private function validateField(event:Event):void{ 
      event.target.setFocus(); 
} 

The problem is that even after setting the focus back to the first 
element the control is not coming back to the said control. 

Please let me know if anyone else has found a solution to this problem. 

Regards,