Well to answer my own question:

Opening a window from a many2one widget and providing other buttons than the provided "Save", "Cancel" on the top left will let you do function call (type="object") but will not close if you: return {'return':True, 'type':'ir.actions.act_window_close' }

If you want your ui-dialog to close on your custom button press you must return the view of the form you wish to return to: ie. return from function_name():

        view = { 
        'name':_("Your View Title"),
        'view_mode': 'form',
        'view_id': False,
        'view_type': 'form',
        'res_model': 'my.table',
        'res_id': res_id,
        'type': 'ir.actions.act_window',
        'nodestroy': True,
        'target': 'self',
        'domain': '[]',
        'context': context
    }
    return view