VBA to page down in a subform

Hi,

I have a tab control in a subform that is twice as long as the subform. When
I hit a certain field in the tab control I want the subform to automatically
page down so the user see's the entire botton half of the tab control
contents.

Is there a way to do this?

Right now when I navigate through the fields fields and get to the bottom
half of the tab control it only shows the field with the focus at the bottom
of the form and nothing below.

Thanks,
Ken