continuous form, Access 2003 is continuously calculating

[peterleeds]

Could anyone explain why Access 2003 is continuously calculating a
continuous form, when it works perfectly in previous versions?

On reading previous messages I gather that overlapping controls cause
this, but why?

I use a hidden control underneath the whole line to highlight it when
selected.

If I cannot do this in Access 2003, how does one go about getting the
same effect?

Any suggestions would be very much appreciated as I have several such
forms.

Thanks in advance

Peter Rollinson.