This example shows how to load data on demand when you have a Hierarchy Grid - the DetailTemplate contents will be loaded every time the corresponding template is expanded.

Key points of implementation:

1. Setup a Grid with DetailTemplate.

2. In another file, create a component that you want to be nested inside the DetailTemplate. It will contain the desired components (like the nested grid, or any other data representation you need).

3. Use the context of the grid DetailTemplate to pass a [Parameter] to the child component that identifies the parent record.

4. In the OnParametersSetAsync lifecycle method of the child component, pass that ID to the service which loads the data for the component.