DataGrid put footer if there is data

Hi,
Is there a way to check if there is detail then display the UnitCost footer?

Thank you.

<RadzenTabsItem Text="Order Details">
                    <div id="wrapper">
                        <RadzenButton Icon="add_circle_outline" style="margin-bottom: 10px" Text="Add Order Detail" Click="@InsertDetailRow" Disabled="@(_detailToInsert != null)"/>
                        <RadzenButton Icon="save" style="margin-bottom: 10px; " Text="Save Details" id="c2" Click="@((args) => SaveRowDetails(SelectedOrders.FirstOrDefault()?.OrderDetails))"/>
                        <RadzenButton Icon="border_color" style="margin-bottom: 10px; margin-right: 10px" Text="Edit Details" id="c1" Click="@(args => EditRowDetails(SelectedOrders.FirstOrDefault()?.OrderDetails))" @onclick:stopPropagation="true"/>
                    </div>
                    <RadzenDataGrid @ref="_gridDetail" AllowFiltering="true" AllowPaging="true" PageSize="5" AllowSorting="true" Data="@(SelectedOrders.FirstOrDefault()?.OrderDetails)"
                                    TItem="OrderDetail" EditMode="DataGridEditMode.Multiple" RowUpdate="@OnUpdateRowDetail" RowCreate="@OnCreateRowDetail" AllowColumnResize="true" AllowColumnPicking="true" ShowPagingSummary="true" ColumnWidth="150px">
                        <Columns>

                            <RadzenDataGridColumn TItem="OrderDetail" Property="Id" Title="Product Number"/>
                            <RadzenDataGridColumn TItem="OrderDetail" Property="ProductCode" Title="Code">
                                <EditTemplate Context="orderDetail">
                                    <RadzenTextBox @bind-Value="orderDetail.ProductCode" Style="width: 100%; display: block" Name="ProductCode"/>
                                    <RadzenRequiredValidator Text="Product Code is required" Component="ProductCode" Popup="true" Style="position: absolute"/>
                                </EditTemplate>
                            </RadzenDataGridColumn>
                            <RadzenDataGridColumn TItem="OrderDetail" Property="ProductName" Title="Name">
                                <EditTemplate Context="orderDetail">
                                    <RadzenTextBox @bind-Value="orderDetail.ProductName" Style="width: 100%; display: block" Name="ProductName"/>
                                    <RadzenRequiredValidator Text="Product Name is required" Component="ProductName" Popup="true" Style="position: absolute"/>
                                </EditTemplate>
                            </RadzenDataGridColumn>
                            <RadzenDataGridColumn TItem="OrderDetail" Property="UnitCost" Title="Unit Cost">
                                <Template Context="detail">
                                    @string.Format(new System.Globalization.CultureInfo("en-US"), "{0:C}", detail.UnitCost)
                                </Template>
                               <FooterTemplate>
                                    <b>@string.Format(new System.Globalization.CultureInfo("en-US"), "{0:C}", SelectedOrders.FirstOrDefault()?.OrderDetails.Sum(o => o.UnitCost))</b>
                                </FooterTemplate>
                            </RadzenDataGridColumn>

Displaying column footer conditionally is not possible.