Thank you for this question.
uses virtualization for its visual elements and they are created when requested. Only cells that are currently visible can have visual elements and when scrolling they are reused. Because of the virtualization it is not possible to calculate the height for cells that are not visible. However, this feature seems reasonable and will consider implementing it in a future version. I added it as a feature request in our issue tracking system and I updated your Telerik points accordingly.
Should you have any other questions, do not hesitate to ask.
All the best,
the Telerik team
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