How to add WYSIWYG editor button editor in backend block form

Question

when editing product there is wysiwyg button like this

this button will popup wysiwyg editor when you click it and the value goes to the field text with html tag, i've tried the solution in here, but it didnt work at all

is there a way to add it to one of my fieldset that goes like this

$fieldset->addField(
            'custom_field',
            'text',
            array(
                'name'   => 'custom_field0',
                'container_id' => 'attribute-custom0',
                'placeholder' => $this->__('Custom Attribute Field'),
        ));

Answer 1

Try Below Code:

$fieldset->addField(
            'custom_field',
            'editor',
            array(
                'name'   => 'custom_field0',
                'container_id' => 'attribute-custom0',
                'placeholder' => $this->__('Custom Attribute Field'),
                'config'    => Mage::getSingleton('cms/wysiwyg_config')->getConfig(),
                'wysiwyg'   => true,
        ));