Solar_Form::setElelementProperty

    /**
     *
     * Sets the property of one element.
     *
     * @param string $name The element name.
     *
     * @param string $property_name The element property name
     *
     * @param string $property_value The element property value
     *
     * @param string $array Rename the element as a key in this array.
     *
     * @return void
     *
     */
    public function setElementProperty($name, $property_name, $property_value, $array = null)
    {
        $name = $this->_prepareName($name, $array);
        if (! empty($this->elements[$name])) {
            $this->elements[$name][$property_name] = $property_value;
        }
    }