A Vertical Orientation option would make the control usable as a side bar / sub navigation menu. Currently, we're using a PanelBar to achieve this functionality, but it lacks the Adaptive behavior of the Navigation control.
RadNavigation can be setup to expand on hover (see demo - http://demos.telerik.com/aspnet-ajax/navigation/functionality/expand-on-hover/defaultcs.aspx). However, when the menu is collapsed to the More (hamburger) menu this functionality is lost. If the nodes don't have a navigate url they can be clicked to open the sub menu, but if they are set to navigate then clicking will navigate instead of opening the submenu.
while replacing my RadMenu for the new RadNavigation, I was forced to stop because the RadNavigation does not support columns like the RadMenu can e.g. <telerik:RadMenu runat="server" ID="radMainMenu" MaxDataBindDepth="2" EnableRoundedCorners="true" EnableShadows="true" EnableTextHTMLEncoding="true"> <DefaultGroupSettings RepeatColumns="2" RepeatDirection="Vertical" /> </telerik:RadMenu> Keep up the good work, Thanks.