>I checked the order of requerying the bizobj's and comboboxes and got it working better. However, the controls are still blank immediately after the form instantiates. After the initial selections of each of the comboboxes, they will refresh correctly. One other peculiarity: if the second or third choice within the child combobox is selected, and then a new parent choice is selected, the child box will go blank. hmmm...
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Did you check to make sure your views do not have the NO DATA ON LOAD set to true?

OR

If you do use view parameters then you will need to manually requery the bizobjs in the form's init method. In each of the bizobj's postrequeryhook method requery the associated combobox. This is necessary since when the comboboxes were created there was no data available in the views.