Sets one or more CSS classes to be applied to second level non-leaf selected menu items.
A non-leaf item refers to a menu item with children.
Multiple classes are specified by using a space between the class names, as per the HTML class parameter.
These classes are configured in the designer using the Advanced Properties button within the control's Styling Assistant.
These classes are configured in the designer using the Advanced Properties button within the control's Styling Assistant.
Further documentation.