Enable 'Enter' key on login without using Javascript

I already have published one thread which explains the way we can enable Enter key hit on login, 

http://dayasahu.blogspot.com/2013/08/hitting-enter-key-to-login-does-not.html

but this is using JavaScript ,Here I will give an alternate way of achieving the same without Javascript .

Step 1 : Add "SubForm" as parent component

Step 2: Select the Login button component in default command property

The default command property will execute the action/actionlistener when user hits the Enter Key from Keyboard.

Thanks !!!