The Syncfusion native Blazor components library offers 70+ UI and Data Viz web controls that are responsive and lightweight for building modern web apps.
.NET PDF framework is a high-performance and comprehensive library used to create, read, merge, split, secure, edit, view, and review PDF files in C#/VB.NET.
When we are using your sample Nested-Table Group Options you can turn the add new record to be at the top or bottom but the top parent record does not show the area to add a new record. We tried the
this.gridGroupingControl1.TopLevelGroupOptions.ShowAddNewRecordBeforeDetails = true; but that did not show the add new area either.