I seek help on my problem:

I have a main form and on it is a combobox and a subform (continuos form). On the combobox, you can choose if it is VAT exclusive or inclusive. On the subform, you can see the item combobox and a checkbox (checked if the item is vatable). The is another unbound texbox for the tax value computed.



Now, for example I have 5 items inside the subform and my combobox in the main form is VAT inclusive.

My problem now is when I change the value of the combobox in the main form to VAT exclusive, it is suppose to recompute the tax value computed but somehow it does not update the value of the tax computed in the unbound textbox in the subform.

And also, when I check or uncheck the checkbox (if item taxable), only that unbound checkbox is updated where the checkbox is updated. The other unbound textboxes are not updated.

I would like to ask help on how or what is the proper way to do it?