It would be nice to have a PanelBar or something similar for mobile and tablet devices. We've tried, but haven't successfully been able to use the current PanelBar without running into bugs and other issues.
Thank you for the proposition. Instead of creating a new widget from scratch which serves the same purpose, I think the better option would be to report the issue you discovered with the PanelBar via our support channels on telerik.com, to be addressed accordingly. If you can also point an existing third-party mobile UI component with the same functionality, this'll help us compare, research and make the necessary adjustments. Due to the reasons above I'm closing this item.