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Using Radzen you can create master/detail with two grids in three easy steps:
Drop DataGrid component to Radzen design surface, bind it to your first table (in my case Orders from Northwind OData service) and auto-generate columns
Bind first DataGrid to Orders
Define select event for the DataGrid component to invoke Order Details with filter OrderID eq ${event.OrderID} and set a property orderDetails to the result value
Invoke Order Details and set property value
Drop second DataGrid component to Radzen design surface, bind it to orderDetails property and auto-generate columns
Bind second DataGrid to Order Details
Run the application to check Order details for the selected Order
Order Details for selected Order
Enjoy!
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