I’m trying to toggle the column that is grouped in my MudDataGrid by toggling the MudSwitch. By default it is grouped by Entity and a count of items is shown. I want to be able to toggle it to show the count by Agency. Changing the toggle doesn’t do anything. dataGrid.GroupItems() doesn’t do anything. The “hidden” columns I have set toggle appropriately, but that’s it.

I would like to be able to click the switch and toggle columns

<MudDataGrid @ref="dataGrid" T="Incident" Items="@incidentList"  Bordered="true"
             FixedHeader="true" Dense="true" SortMode="SortMode.None" Filterable="false" 
             Groupable="true" ShowColumnOptions="false">
    <ToolBarContent>
        <MudText Typo="Typo.h5">Investigative Tracker</MudText>     
        <MudSpacer />
        <MudTextField @bind-Value="_searchString" Placeholder="Search" Adornment="Adornment.Start" Immediate="true" Class="mb-4 ml-3 pr-5"
                      AdornmentIcon="@Icons.Material.Filled.Search" Style="color: #ffffff;" IconSize="Size.Medium"></MudTextField>
    </ToolBarContent>   
    <Columns>
        <PropertyColumn Property="x => x.AgencyMember.Entity.ToString()" Title="Full Name" Hidden="@groupValue" Grouping="@groupValue" Groupable="true" >
            <GroupTemplate>
                <span style="font-weight: bold;">
                    <MudChip Variant="Variant.Text" Style="background-color: transparent;" Color="Color.Tertiary" Size="Size.Small">
                        <table><td style="width: 250px;">@context.Grouping.Key</td> <td style="width: fit-content;">Count: @context.Grouping.Count()</td></table>
                    </MudChip>
                </span>
            </GroupTemplate>
        </PropertyColumn>
        <PropertyColumn Property="x => x.AgencyMember.Agency.Code" Title="Agency" Hidden="@(!groupValue)" Grouping="@(!groupValue)" Groupable="true">
            <GroupTemplate>
                <span style="font-weight: bold;">
                    <MudChip Variant="Variant.Text" Style="background-color: transparent;" Color="Color.Tertiary" Size="Size.Small">
                        <table><td style="width: 250px;">@context.Grouping.Key</td> <td style="width: fit-content;">Count: @context.Grouping.Count()</td></table>
                    </MudChip>
                </span>
            </GroupTemplate>
        </PropertyColumn>
        <PropertyColumn Property="x => x.AgencyMember.Agency.Description" Title="Description" />
        <PropertyColumn Property="x => x.ReceivedDateTime" Title="Created" />
        <PropertyColumn Property="x => x.LastUpdateTimeStamp" Title="Last Update" />        
    </Columns>
</MudDataGrid>

My @Code block

@code {
    private string _searchString = string.Empty;
    private List<Incident> incidentList = [];
    private MudDataGrid<Incident> dataGrid = default!;
    private MudSwitch<bool> groupBySwitch = default!; 
    private bool groupValue = true;

    protected async override Task OnInitializedAsync()
    {
        incidentList = await _trackerRepo.GetIncidentsAsync();
        groupBySwitch.Value = true;
    }

    // Toggle Group By
    private async Task GroupByChanged(bool isChecked)
    {
        if (isChecked)
        {
            groupValue = true;
        }
        else
        {
            groupValue = false;
        }
        dataGrid.GroupItems();
    }

    // happens everytime a row is edited, added
    private async Task CommittedItemChanges(Incident item)
    {

    }

    // quick filter - filter globally across multiple columns with the same input
    private Func<Incident, bool> _quickFilter => x =>
    {
        if (string.IsNullOrWhiteSpace(_searchString))
            return true;

        return false;
    };
}