What you can do is change the style property of your tab control to none.
This will hide your tabs completely. Then you can add buttons to your liking within your form which on clicked sets the focus of the appropriate page of the tab control
ie with the on click event of your fancy new button....
Me.MyTabControl.Pages(4).SetFocus
which will display the fourth page of the tab control.
I agree though - do what you can to change the horrible form designs MS Access defaults to.