RadzenDataGrid with RadzenCheckBox

Radzen.Blazor Components
1

Hi,
I want to use TriState RadzenCheckBoxes in a grid but they do not appear how they would should and the are not clickable. Could you help me please?
These checkboxes have null values in the picture.
image

<RadzenDataGrid @ref="grid" class="selectableTableRow"
                IsLoading=@isLoading Count="@count" Data="@VoucherDtos"
                LoadData="@LoadData" AllowSorting="true" AllowFiltering="true" FilterMode="FilterMode.Simple" AllowColumnResize="true" ShowPagingSummary="true"
                AllowPaging="true" PageSize="5" PagerHorizontalAlign="HorizontalAlign.Center" AllowColumnPicking="true"
                TItem="VoucherDto" ColumnWidth="200px"
    <Columns>
        ...
        <RadzenDataGridColumn TItem="VoucherDto" Property="IsApproved" Filterable="true" Title="Állapot" Frozen="true" Width="70px" TextAlign="TextAlign.Center">
            <Template Context="data">
                <RadzenCheckBox TriState=true @bind-Value=@data Name="CheckBox3" />
            </Template>
        </RadzenDataGridColumn>        
    </Columns>
</RadzenDataGrid>
2
3

I did not give the correct @bind-Value=@data parameter. The correct is @bind-Value=@(data.IsApproved)

Thank you.