ZF-2551: Posiibility to add cusomized DisplagGroup
Maybe I am wrong, but it seems that there is no way to extend Zend_Form_DisplayGroup and then add it to Zend_Form. Currently the addDisplayGroup() instantiates Zend_Form_DisplayGroup. It might be helpful to add the possibility to pass the prefix and the path where the extended class can be found as optional arguments of addDisplayGroup() or as additional keys of $options array. The other way could be using Zend_Loader_PluginLoader class and setting custom DisplayGroups location during Zend_Form instantiation exactly as for custom Element classes.