Hi, I have written Vendor specific Credential provider (a tile is created so that user can select that tile) for Windows Vista which is used for collecting credentials from my smart card (certificate based) and pass it to kerberos for authentication. If smart card contains two or more certicated in that case default certificate is used for authentication. I want to extend my feature so that if more than one certificate is present either of the following should happen. 1) 'X' number of vendor specific tiles should be created corresponding to 'X' number of certificates present in smart card. 2) ComboBox should be displayed just below credential provider tile listing all container names of all certificates present in smart card. Depending upon container name selected credential provider can collect credentials from the corresponding certificate. Just wanted to know which one would be best solution (I have some development time constraint also). Also Please specify what changes needed in my existing Credential provider in order to achieve desired functionality. I am waiting for your prompt response.Regardswanni