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Currently we do not offer direct JumpList equivalent for WP 8.1 Universal. A possible solution would be to feed DataBoundListBox with flatten data where some of the items represents groups and display them with different data template.
Also, it might be interesting to mention that we are working on data control (ListView) for Windows Universal, that will be capable of displaying group data, support different layouts and data shaping operations. We have scheduled to release it with our next official release early next year.
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