<TelerikGrid @ref="@SafexTransactionGrid"
             Data=@SafexContractTransactionGridData
             ConfirmDelete="true"
             Pageable="true"
             Groupable="true"
             Sortable="true"
             FilterMode="GridFilterMode.FilterMenu"
             Resizable="true"
             Reorderable="true"
             EditMode="GridEditMode.Popup"
             SelectionMode="GridSelectionMode.Multiple"
             PageSize="15"
             Navigable="true">
    <GridColumns>
        ...
        <GridColumn Field="@nameof(SafexContractTransaction.Trader.Name)" Title="Trader Name" Editable="false"/>
        ...
    </GridColumns>
</TelerikGrid>

@code {

    private List<SafexContractTransaction> SafexContractTransactionGridData
    {
        get
        {
// returns all the data including populated Trader property
return FourtyTwoUnitOfWork.SafexContractTransactionRepo.GetAll(SafexContractGrid.SelectedItems);;
            }
        }
    }

    private TelerikGrid<SafexContractTransaction> SafexTransactionGrid { get; set; }

}
Yet when the grid is displayed it does not contain the property. 

How can I solve this? 

<TelerikRootComponent>
    <TelerikGrid Data="@GridData"
                 Height="350px"
                 Sortable="true"
                 Pageable="true"
                 SortMode="@SortMode.Single"
                 FilterMode="@GridFilterMode.FilterMenu"
                 FilterMenuType="@FilterMenuType.CheckBoxList"
                 PageSize="10">
        <GridColumns>
            <GridColumn Field="Col1" Width="80px" Locked="true" />
            <GridColumn Field="Col2" Width="140px" />
        </GridColumns>
    </TelerikGrid>
</TelerikRootComponent>

@code { public List<dynamic> GridData = new List<dynamic>();

    protected async override Task OnInitializedAsync()
    {
        for (int i = 1; i < 10; i++)
        {
            dynamic row = new ExpandoObject();
            row.Col1 = $"col1_{i}";
            row.Col2 = $"col2_{i}";
            GridData.Add(row);
        }

    } }

              <TelerikGrid Data="@PackedInfo.PackedParts" Height="100%">
                    <GridColumns>
                        <GridColumn Field=@nameof(PackedPart.Part.PartNo) Title="Part no" />
                        <GridColumn Field=@nameof(PackedPart.Part.PartDescription) Title="Description" />
                        <GridColumn Field=@nameof(PackedPart.UnitWeightG) Title="Substance Weight" />
                        <GridColumn Field=@nameof(PackedPart.FlashPointCentigrade) Title="Flash point" />
                        <GridColumn Field=@nameof(PackedPart.Pg) Title="PG" />
                        <GridColumn Field=@nameof(PackedPart.Qty) Title="PG" />
                    </GridColumns>
                </TelerikGrid>

               <TelerikGrid Data="@PackedInfo.PackedParts" Height="100%">
                    <GridColumns>
                        <GridColumn Field="Part.PartNo" Title="Part no" />
                        <GridColumn Field="Part.PartDescription" Title="Description" />
                        <GridColumn Field=@nameof(PackedPart.UnitWeightG) Title="Substance Weight" />
                        <GridColumn Field=@nameof(PackedPart.FlashPointCentigrade) Title="Flash point" />
                        <GridColumn Field=@nameof(PackedPart.Pg) Title="PG" />
                        <GridColumn Field=@nameof(PackedPart.Qty) Title="PG" />
                    </GridColumns>
                </TelerikGrid>

<TelerikButton OnClick="@CurrentPage">Current Page</TelerikButton>
<TelerikButton OnClick="@AllPages">All Pages</TelerikButton>

<TelerikGrid Data="@GridData"
             @ref="@GridRef"
             Pageable="true"
             Sortable="true"
             Resizable="true"
             Reorderable="true"
             FilterMode="@GridFilterMode.FilterRow"
             Groupable="true">



    <GridExport>
        <GridExcelExport FileName="telerik-grid-export" AllPages="@ExportAllPages" />
    </GridExport>

    <GridColumns>
        <GridColumn Field="@nameof(SampleData.ProductId)" Title="ID" Width="100px" />
        <GridColumn Field="@nameof(SampleData.ProductName)" Title="Product Name" Width="300px" />
        <GridColumn Field="@nameof(SampleData.UnitsInStock)" Title="In stock" Width="100px" />
        <GridColumn Field="@nameof(SampleData.Price)" Title="Unit Price" Width="200px" />
        <GridColumn Field="@nameof(SampleData.Discontinued)" Title="Discontinued" Width="100px" />
        <GridColumn Field="@nameof(SampleData.FirstReleaseDate)" Title="Release Date" Width="300px" />
    </GridColumns>
</TelerikGrid>

@code {
    async Task AllPages()
    {
        ExportAllPages = true;

        await Task.Delay(20); // allow the component to rerender with the new parameter

        await GridRef.SaveAsCsvFileAsync();

        //await GridRef.SaveAsExcelFileAsync(); // this works
    }

    async Task CurrentPage()
    {
        ExportAllPages = false;

        await Task.Delay(20); // allow the component to rerender with the new parameter

        await GridRef.SaveAsCsvFileAsync();

        //await GridRef.SaveAsExcelFileAsync(); // this works
    }


    private TelerikGrid<SampleData> GridRef { get; set; }


    List<SampleData> GridData { get; set; }
    bool ExportAllPages { get; set; }

    protected override void OnInitialized()
    {
        GridData = Enumerable.Range(1, 100).Select(x => new SampleData
        {
            ProductId = x,
            ProductName = $"Product {x}",
            UnitsInStock = x * 2,
            Price = 3.14159m * x,
            Discontinued = x % 4 == 0,
            FirstReleaseDate = DateTime.Now.AddDays(-x)
        }).ToList();
    }

    public class SampleData
    {
        public int ProductId { get; set; }
        public string ProductName { get; set; }
        public int UnitsInStock { get; set; }
        public decimal Price { get; set; }
        public bool Discontinued { get; set; }
        public DateTime FirstReleaseDate { get; set; }
    }
}

<TelerikGrid FilterMode="Telerik.Blazor.GridFilterMode.FilterRow"
             Data="@GridData"
             Resizable="true">
    <DetailTemplate>
        detail template
    </DetailTemplate>
    <GridColumns>
        <GridColumn Field="Id" />
        <GridColumn Field="Id" Title="Resize Me First" />
        <GridColumn Field="Id" Title="Resize Me First" />
    </GridColumns>
</TelerikGrid>

@code {
    List<GridModel> GridData { get; set; }

    protected override void OnInitialized()
    {
        List<GridModel> data = new List<GridModel>();

        for (int i = 1; i <= 3; i++)
        {
            data.Add(new GridModel { Id = i });
        }

        GridData = data;
    }

    public class GridModel
    {
        public int Id { get; set; }
    }
}

@using Telerik.DataSource

<TelerikGrid Data=@GridData @ref="TheGrid"
             Groupable="true"
             OnStateInit="@((GridStateEventArgs<User> args) => OnStateInitHandler(args))">
    <GridColumns>
        <GridColumn Title="Personal Information">
            <Columns>
                <GridColumn Field=@nameof(User.LName) Title="Last Name" />
                <GridColumn Field=@nameof(User.FName) Title="First Name" />
            </Columns>
        </GridColumn>
        <GridColumn Title="Status and Last Login">
            <Columns>
                <GridColumn Field=@nameof(User.StatusName) Title="StatusName" />
                <GridColumn Field=@nameof(User.LastLoginDate) Title="Last Login" DisplayFormat="{0:yyyy-MMM-dd}" />
            </Columns>
        </GridColumn>
    </GridColumns>
</TelerikGrid>

@code {
    TelerikGrid<User> TheGrid { get; set; }
    List<User> GridData { get; set; }

    protected override void OnInitialized()
    {
        var data = new List<User>();
        for (int i = 1; i <= 20; i++)
        {
            data.Add(new User()
            {
                Id = i,
                FName = "First Name " + i,
                LName = "Last Name " + i,
                StatusId = i * 123,
                LastLoginDate = DateTime.Now,
                StatusName = "Status Name " + (i % 5 + 1)
            });
        }
        GridData = data;
    }

    private void OnStateInitHandler(GridStateEventArgs<User> args)
    {
        GridState<User> desiredState = new GridState<User>()
        {
            GroupDescriptors = new List<GroupDescriptor>()
            {
                new GroupDescriptor()
                {
                    Member = nameof(User.StatusName),
                    MemberType = typeof(string)
                }
            }
        };

        // will trigger an exception if grouping by a nested column
        args.GridState = desiredState;
    }

    @*protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (firstRender)
        {
            var desiredState = TheGrid.GetState();

            desiredState.GroupDescriptors = new List<GroupDescriptor>()
            {
                new GroupDescriptor()
                {
                    Member = nameof(User.StatusName),
                    MemberType = typeof(string)
                }
            };

            await TheGrid.SetState(desiredState);
        }

        await base.OnAfterRenderAsync(firstRender);
    }*@

    public class User
    {
        public long Id { get; set; }

        public int StatusId { get; set; }
        public string StatusName { get; set; }

        public string FName { get; set; }
        public string LName { get; set; }

        public DateTime LastLoginDate { get; set; }
    }
}