It seems simple to me but maybe I'm missing something. Here goes...

Pass the name of the table to the form like

Do form someform with lcTableName

In the init method of the form have

LPara vcTableName
**CurrentTable is a custom property that you will have to add to the form
Thisform.CurrentTable = vcTableName

In the Activate method of the form have

Thisform.cboFields.RowSource = Thisform.CurrentTable
Thisform.cboFields.RowSourceType = 6 && Fields
Thisform.cboFields.Requery() &&don't know if it's neccessary but I'd do it anyway