[fw-general] proper way to instantiate a display group without $form->addDisplayGroup

[Guillaume ORIOL]

Hi,

I am new to i18n and, until now, I was adding display groups to my forms 
this way:

        $form->addDisplayGroup(
            array('field1', 'field2', 'field3'),
            'global',
            array(
                'displayGroupClass' => 'My_DisplayGroup',
                'legend' => 'My legend'
            )
        );

I setup a Zend_Translate object with the gettext adapter and I am using 
POEdit to write translations. Unfortunately, one can not enter keys 
manually in POEdit: it has to find them automatically in source files.
I configured it with keywords like "setLabel", "setDescription" and 
"setLegend". But in the code above, there is no "setLegend" function.
So, I would like to rewrite that code to something like:

        $displayGroup = new My_DisplayGroup($options);
        $displayGroup->setLegend('My legend');

But I can't find the proper way to instantiate my custom display group 
(the correct options to pass to it).

Could somebody help me?
--
Guillaume ORIOL
Software engineer
Technema