Is there a way to independently access each of the two controls (date picker and time drop down box) that are part of the scheduledstart (Start Time) field on the appointment entity?

Is there a way to independently access each of the two controls that are part of the  scheduledstart (Start Time) field on the appointment entity?

I need to set focus to the time control once the date is set via the date control. 

Is there some way to do formContext.getControl(fieldname.controlname).setFocus() ?

Specifically, when the date is set via the date control, I need to issue some kind of command like formContext.getControl(scheduledstart.timecontrol).setFocus()

I know the field name is scheduledstart but what is the control name?

If there is a way to access the specific controls, that would be helpful.