Another approach you can have is to use a button that will open a RadWindow with the simple grid for details, in a fashion similar to the following demo: https://demos.telerik.com/aspnet-ajax/controls/examples/integration/gridandwindow/defaultcs.aspx?product=window. The benefit of this approach is that you can keep the details grid in a separate form, thus making each form more lightweight, faster and simpler. It also reduces the content loaded initially, which is also a good performance optimization, especially when you don't expect the users to always interact with the details.
Regards,
Marin Bratanov
Progress Telerik
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