In datasheet view, how to display a hidden field

[anniebai]

I am testing a form converted from access 2003 to 2007. This form has two keys (StudentID and ProjectID).
if I choose form view, both fields displays. but if in datasheet view, only ProjectID show up. There's no code behind. and the visible value of StudentID is yes. What else shall I do to display the studentID field on datasheet view?

And more, in form view, although "allow delete", "allow addition" are all set as yes, the form view doesn't show the status bar at the bottom.

BTW, this is a simple form, no code behind.

Thanks for any inputs.