In a week or two we have a planned Q1 2015 official release coming. This release would feature a new control called RadNavigation. It is designed to handle scenarios where customers want to have a mobile menu on window resize.
Currently, this could be achieved by using two menus, one in Lightweight and one in Mobile render mode, and hiding one of them with media queries, while showing the other.
I would recommend you to wait for the upcoming official release and try the RadNavigation control instead. There will be demos with the release, which would help you to quickly explore the new control and its functionalities.
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