Credential Provider Without Password

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C++

Win32

Hi,
I am developing Credential provider for One Time Password. There I am able to create for Logon, unlock workstation, CredUI, password must change, password Expire.
There I am using Sample iCredentialProvider which is provided by Microsoft, I am using three fields to login credential Tile
1:- user name
2:- password
3:- OTP Key
And I am able to handle all cases but I just want to reduced one field 2:- password and want to keep only two field on login screen of windows 7 as
1: -User Name
2:- OTP Key or Password
Means I have to login on my window 7 as enter OTP Key or Password as RSA SecurID provided you can login on your window as you enter passcode or you enter password respectively means if don’t enter password and enter only OTP key then windows have to login without asking password, if there are any solution please tell me…
Thanks in advance.