Change control properties

I am trying to change some control properties in my Access report at runtime with VB code.
1. I know that I cannot "change values" of the control as stated in MSDN.
2. I am not sure of the code to access the control because the control is in a sub report. I also am not sure if I code it in the subreport or in the main report.
3. And, I cannot figure out which Event fires at each record in the main report.

I know that there are no events for controls in the report, but can I get code to fire on each record?