Sharing a similar concept as a tree view control, WebSlidingMenu displays data in hierarchical mode using XML document. You can use XMLDataSource to connect your XML document to WebSlidingMenu.

WebSlidingMenu only support XMLDataSource control for the binding capability.

When bound, WebSlidingMenuItemBinding objects are added to WebSlidingMenuItemBinding collection to enables you further customize individual item. The settings are automatically mapped to WebSlidingMenuItem property.

Hope this helps.

Please ensure that you have added the child item of WebSlidingMenuItem (Items collection of WebSlidingMenuItem). If the “ContentMode” the child item is “IFrame”, please ensure that the “ContentURL” property of the child item is set to a proper link.

Hope this helps.