Can't get tkinter database aware cascading comboboxes to update properly

[dford]

I'm trying this right now, based on something I saw in another discussion on this group, but don't know the syntax for that last line. It doesn't like just "row" in the append. The fetchall is returning a tuple.

cboTaskStep.delete(0,'end')
thiscur=cnxn.cursor()
sql2="Select StepDescription, TaskStepID from TaskSteps where TaskID = " +str(mydict[cboTask.get()])
thiscur.execute(sql2)
cnxn.commit()
    for row in thiscur.fetchall():
        cboTaskStep.append(row)