Hi Paulo,
The skeleton will be a nice addition to the Telerik AJAX suite and I changed the status of your feature request to Unplanned (Approved). Depending on our Product Management and the popularity of this item, we will prioritize its execution in a future release. Stay tuned for updates in the feedback portal item.
The control is also available in the Kendo UI suites - https://demos.telerik.com/kendo-ui/skeletoncontainer/index.
Regards,
Rumen
Progress Telerik