yiisoft/yii2 — pull request #4346 by thiagotalma (2014-07-17 20:12:26+00:00)
Title: Option to render the Nav subitems as a Dropdown (or not)

Navigation is not always done with Dropdown.

On the website "Themeforest" many themes for the Bootstrap, use a sidebar for navigation without Dropdown.

It's nice to have the option to also generate sub items as a list.

Even if the implementation is not the way I propose, would be very important to have this option.