Writing test cases for Users login and selecting a correct certificate

I’m trying to test different Users using different cert to login an application.  For example: user1 has certA, user2 has certB, ect…. 

When the Window Security dialog displays, I can see different certificates (certA, certB, ect…) that I can select.  For example, I used User2 and selected certB and clicked the OK button.  The Window Security dialog closes and then a Password dialog of my application displayed.

When I played back, it seemed to select the one in the first row; which is certA

When I looked at the step in this test, it displays the “Handle ‘Generic’ dialog”.  I can’t seem to manipulate this line so that it can pick the correct certificate for my test.  I even used the up and down keys on the keyboard when I re-record the step and it still didn’t work.

Could someone help?

I’m running stand-alone Test studio.

Thanks,
Mindy