Disable Record Navigation

Hi there I found alot of nice tips here, thanks for that :) But I havent found exactly what I am looking for. I will keep searching but I thought I would post as well.

Here is my problem : I have to design a form that works like an old application form written in VFP7.

Basically a combo box chooses a customer, another combo box filtered by customer chooses a job. A third combo box filtered by Jobs chooses a stock.

There is a subform linked by Stock_ID that displays details of the stocks, amounts, locations, etc...

I want to limit record navigation to these combo boxes. Right now even with navigation buttons hidden and limiting tab cycle to current record; a user can use the mousewheel and page up / page down keys to change the current record in Stock table and thus changing the details in my sub form.

Does anyone know of a way to stop all record navigation unless I explicitly move the record pointer via code behind the combo boxes?

I will keep looking around here and will likely play with the Current event to reverse any changes made to the record pointer but it does not seem the best way to handle this.

Thanks much :)

ps Im using Access 2003