Thanks for writing and for your feedback.
We do already have plans to build controls like the toolkit's HubTile and ExpanderView. The ExpanderView in particular would surely use the UI virtualization capabilities we already have.
Here's a link to our roadmap:
Please note, that some of the contents here are not up to date but in general we're planning in the directions discussed in the roadmap.
Let us know if you have any further feedback or suggestions for new controls.
Thanks for your time.
the Telerik team
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