Thank you for contacting us. Based on the information in your scenario we can conclude that item template contains complex visual tree. If you could share more information regarding the template we can suggest ways for optimizations.
Currently, based on the information we can suggest two options:
- Force JumpList to realize all its containers by placing it within ScrollViewer with disabled horizontal and vertical scrollbars. Note that this can result in high memory consumption and long initial loading time.
- If you are looking for headers only and this is the missing functionality that does not allows you to use DataBoundListBox you can mimic group headers by custom template selector.
Either way, any additional information can help us better understand the scenario and propose best suitable solution.
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