>I've got a review screen which will have an unknown number of items to check before saving (these are held in a table and can change). IOW
>
>chkbx1 Checklist Item 1 description
>chkbx2 Checklist Item 2 description
>etc
>
>I can build the checkboxes 'on the fly' within the form, but may have more than will fit on one form, so I was thinking if there was someway to set up an array, I could display within a dropdown list.

Put them inside a scrollable container (i.e. a container inside a container, where the inner container's .top can go negative, and the .height of the inner one is larger than that of the outer container). These can be found among the downloads, or you can simply check that the current checkbox is visible by manipulating the inner container's .top property.