Need help fixing control to show AM, PM time, not 24 hour time

I've have the c++ source code for a dayview control that displays the time on the control in 24 hour time; 01, 02, 13, 14, (like military hours). I would like to change the display time to show 12 hour AM and PM time.

Can anyone help with finding where the code is that sets up the 24 hour display time, and then how to change this to show 12 hour am, pm time?

The original develper seems to have abandoned the project.

I've attached the c++ source, and a vb sample program.

One more issue in the vb sample app. The scroll down doesn't work. When you click on the down arrow, the display just flickers some, but the times don't move.

Any help is greatly appreciated with either of these issues.

Thanks, Chris.