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Hello Ted,
You can Follow the implementation of such a feature in this page (I added your Vote for you): https://feedback.telerik.com/blazor/1430980-conditionally-hide-hierarchical-grid-expand-button
In the meantime, you can add an if-block in the detail template and show a "no data" type of message when there is no data for the child components.
Regards, Marin Bratanov Progress Telerik