Here is my links code:

links = [
            dict(header='Balance', body=lambda row: row.po.amount - 
row.invoice_items.amount_pretax),
            dict(header='Controls', body=[
                lambda row: A('Invoices',_class='button btn 
btn-default',_href=URL('invoice', 'list', args=['commitment', row.po.id], 
vars=dict(source=here))),
                lambda row: A('Edit',_class='button btn 
btn-default',_href=URL('edit', args=row.po.id, vars=dict(source=here))),
                lambda row: A('Files',_class='button btn 
btn-default',_href=URL('attachments', 'list', 
args=['commitment',row.po.id], vars=dict(source=here))),
                lambda row: A('Delete',_class='button btn 
btn-default',_href=URL('delete', args=row.po.id, vars=dict(source=here)))
             ]
        ]

However, I get an "attribution error" for the first dict, and a "list not 
callable" for the controls dict.

What is the correct method for adding multiple columns with one column 
having multiple links in it?

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