Hello everyone,

Until we fix this issue, here is a possible workaround for in-cell editing. Another option is to switch the Grid to popup edit mode.

1. Use the Grid OnStateChanged event to track the Grid scroll position via the Skip property of the GridState.
2. Measure or hard-code how many visible rows the Grid can display. This will depend on the theme, the Grid Height and the RowHeight.
3. Use the Grid OnEdit event to check if the edited row is outside the viewable area (for example, item index > Skip + visible rows).
4. If this is the case, then increment the Skip property in the Grid state and initiate editing of the same Grid item programmatically.

   <TelerikGrid @ref="@GridRef"
                Data="@GridData"
                EditMode="@GridEditMode.Incell"
                Navigable="true"
                ScrollMode="@GridScrollMode.Virtual"
                RowHeight="42"
                Height="400px"
                PageSize="10"
                OnUpdate="@OnGridUpdate"
                OnCreate="@OnGridCreate"
                OnStateChanged="@( (GridStateEventArgs<Product> args) => GridSkip = args.GridState.Skip )"
                OnEdit="@OnGridEdit">
       <GridToolBarTemplate>
           <GridCommandButton Command="Add" Icon="@SvgIcon.Plus">Add Item</GridCommandButton>
       </GridToolBarTemplate>
       <GridColumns>
           <GridColumn Field="@nameof(Product.Name)" Title="Product Name" />
           <GridColumn Field="@nameof(Product.Price)" Title="Unit Price" />
           <GridColumn Field="@nameof(Product.Stock)" Title="Units In Stock" />
           <GridColumn Field="@nameof(Product.ReleaseDate)" Title="Release Date" />
           <GridColumn Field="@nameof(Product.Discontinued)" Title="Discontinued" />
       </GridColumns>
   </TelerikGrid>
   
   @code {
       TelerikGrid<Product> GridRef { get; set; }
   
       List<Product> GridData { get; set; }
   
       int? GridSkip { get; set; } = 0;
   
       int VisibleRowsInGrid = 7;
   
       private async Task OnGridEdit(GridCommandEventArgs args)
       {
           var originalEditItem = (Product)args.Item;
           var itemIndex = GridData.FindIndex(x => x.Id == originalEditItem.Id);
           if (itemIndex >= GridSkip + VisibleRowsInGrid)
           {
               var gridState = GridRef.GetState();
               gridState.Skip += 1;
               gridState.OriginalEditItem = originalEditItem;
               gridState.EditItem = originalEditItem.Clone();
   
               await GridRef.SetStateAsync(gridState);
           }
       }
   
       private void OnGridUpdate(GridCommandEventArgs args)
       {
           var argsItem = args.Item as Product;
           var index = GridData.FindIndex(i => i.Id == argsItem.Id);
           if (index != -1)
           {
               GridData[index] = argsItem;
           }
       }
   
       private void OnGridCreate(GridCommandEventArgs args)
       {
           var argsItem = args.Item as Product;
   
           argsItem.Id = GridData.Count + 1;
   
           GridData.Insert(0, argsItem);
       }
   
       private void OnGridDelete(GridCommandEventArgs args)
       {
           var argsItem = args.Item as Product;
   
           GridData.Remove(argsItem);
       }
   
       protected override void OnInitialized()
       {
           GridData = new List<Product>();
   
           var rnd = new Random();
   
           for (int i = 1; i <= 500; i++)
           {
               GridData.Add(new Product()
                   {
                       Id = i,
                       Name = $"Product {i}",
                       Price = (decimal)(rnd.Next(1, 100) * 3.14),
                       Stock = (short)rnd.Next(0, 1000),
                       ReleaseDate = DateTime.Now.AddMonths(-rnd.Next(0, 120)).AddDays(rnd.Next(1, 30)),
                       Discontinued = Convert.ToBoolean(rnd.Next(0, 2))
                   });
           }
       }
   
       public class Product
       {
           public int Id { get; set; }
           public string Name { get; set; }
           public decimal? Price { get; set; }
           public short? Stock { get; set; }
           public DateTime? ReleaseDate { get; set; }
           public bool Discontinued { get; set; }
   
           public Product Clone()
           {
               return new Product()
                   {
                       Discontinued = Discontinued,
                       Id = Id,
                       Name = Name,
                       Price = Price,
                       ReleaseDate = ReleaseDate,
                       Stock = Stock
                   };
           }
       }
   }

Regards,
Dimo
Progress Telerik