What Codemine classes should I base my classes on to accomplish the following?

A main form class has a grid for navigating through a cursor along with textboxes, comboboxes and command buttons for searching and filtering the data as well as editing, adding, deleting, printing a simple list, etc. If "edit" or "new" are chosen, a child form is used to edit a single record.

I would like to make the child form able to work in two ways: either multiple records can be edited at the same time, or navigation in main form refreshes a single child form. (Side question: Do you think having two modes of operation would be confusing to users?)

I am guessing the main form should be based on frmDataManagerFormCustom, but what should the second form be based on?

TIA,

Alex