Moving to First Record On Subform

We are a consultant that frequently bills on a Time and Material basis. I
have an unbound form with three subforms.

The first shows a summary of outstanding Hours and their value (Extd = Hours
* Billing Rate) for each project that has not yet been invoiced.

The second shows project detail, summarizing the number of hours and the
value for each staff member who worked on the project selected in the first
subform. (The OnCurrent event of the first writes the key to an unbound
textbox on the main form to which the 2nd subform is linked).

The third subform shows staff detail of each day, the number of hours, and
the value for the staff member selected in the 2nd subform.

If a new project is selected in the 1st, I'd like to move the cursor to the
first record in the 2nd & 3rd subforms, and if a new staff member is selected
in the 2nd, move to the first record in the 3rd. Can anyone help?

Thank you.
Sprinks