public function remove_control_from_stack(Element_Base $element, $control_id)
{
$stack_id = $element->get_name();
if (empty($this->_controls_stack[$stack_id][$control_id])) {
return new \WP_Error('Cannot remove not-exists control.');
}
unset($this->_controls_stack[$stack_id][$control_id]);
return true;
}