Solution found! Look at the setElementDecorators() description:
/**
     * Set all element decorators as specified
     *
     * @param  array $decorators
     * @param  array|null $elements Specific elements to decorate or exclude
from decoration
     * @param  bool $include Whether $elements is an inclusion or exclusion
list
     * @return Zend_Form
     */
    public function setElementDecorators(array $decorators, array $elements
= null, $include = true)

there is 2nd parameter, where you can specify which elements to
include/exclude from setting decorators, so you can aviod owerwriting
decorators for some desired elements :)

Regards,
Saša Stamenković


On Wed, Sep 30, 2009 at 7:49 AM, Саша Стаменковић <[email protected]>wrote:

> *Fatal error*: Call to a member function addDecorator() on a non-object
> in...
>
> Regards,
> Saša Stamenković
>
>
>
> On Tue, Sep 29, 2009 at 4:34 PM, alayn <[email protected]> wrote:
>
>> Have you tried with something like:
>>
>> $form->setElementDecorators(
>>        .
>>        .
>>        .
>> );
>> $form->third_element_name->setDecorators(
>>        .
>>        .
>>        .
>> );
>>
>> I think it should work...
>>
>> El mar, 29-09-2009 a las 06:46 -0700, umpirsky escribió:
>> > Hi.
>> >
>> > I'm trying to do the following thing.
>> >
>> > I have some form, and I'm putting elements on it one by one, when I
>> finish,
>> > I call setElementDecorators() to customize rendering. That works
>> perfect,
>> > but now I want to add decorator to 3rd element, but
>> setElementDecorators()
>> > owerwrites them, if I call setElementDecorators before adding elements,
>> it
>> > takes no effect!
>> >
>> > How can I achieve this without setting decorators for each element one
>> by
>> > one?
>> >
>> > Regards,
>> > Sasa Stamenkovic.
>>
>>
>

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