I would like to have an event equivalent to the OnRead for the Grid so that I could make custom data operations such as applying custom filtering to the root items. 

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ADMIN EDIT

In the meantime, loading data on demand only when a node expands can make database queries happen less often and return less data: https://docs.telerik.com/blazor-ui/components/treelist/data-binding/load-on-demand

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I want to show the totals in my hierarchical data

At the moment, clicking a row always alters the selection. I want to use only the selection column for selection so row clicks don't change it. A key issue is that when SelectChildren is set to true it only works for the checkbox, so clicking the row removes the selected children, and I don't want that.

I now have a treelist with a few thousand items, but the filtering takes a few seconds, and halfway there is a refresh with partial results.

Now the users are complaining that they do not really know when the treelist is done with filtering.

I would like to start the tree grid with all rows collapsed. At the moment I can do this only through load on demand.

*** Thread created by admin on customer behalf ***

I would like the TreeList to support row virtualization. It will be useful when working with large data.