sintonia/application/forms/AddShowStyle.php

<?php

class Application_Form_AddShowStyle extends Zend_Form_SubForm
{

    public function init()
    {
       // Add show background-color input
        $this->addElement('text', 'add_show_background_color', array(
            'label'      => 'Background Colour:',
            'required'   => true,
            'filters'    => array('StringTrim'),
            'validators' => array('NotEmpty')
        ));

	// Add show color input
        $this->addElement('text', 'add_show_color', array(
            'label'      => 'Text Colour',
            'required'   => true,
            'filters'    => array('StringTrim'),
            'validators' => array('NotEmpty')
        ));
    }


}