I'm using this syntax:
<TelerikMultiSelect Class="searchSurveyor" ClearButton="true" OnRead="ReadItems" Filterable="true" Placeholder="Search Surveyor" OnChange="SetSurveyors"
                                Width="100%" Data="@_surveyorsData" TextField="TextField" ValueField="ValueField"
                                @bind-Value="_selectedSurveyorsData">

</TelerikMultiSelect>

I want to make it act like a single select where the last selected value replaces the first. But manipulating the bind-value doesn't seem to help
        private async void SetSurveyors(object theUserInput)
        {
            if (theUserInput == null) return;

            _selectedSurveyorsData = (List<string>)theUserInput;
            if (_selectedSurveyorsData.Count > 1)
            {
                _selectedSurveyorsData[0] = _selectedSurveyorsData[1];
                _selectedSurveyorsData.RemoveAt(1);
            }

        }
Any idea?

TelerikGrid @ref="@Grid"
             Data="@GridData" 
             Pageable="true"
             @bind-PageSize="@PageSize"
             Sortable="true"
             FilterMode="GridFilterMode.None"
             Resizable="true"
             Reorderable="true"
             EditMode="GridEditMode.None"
             Navigable="true"
             Class="slim-grid-paddings">
    <GridSettings>
        <GridPagerSettings InputType="PagerInputType.Input"
                           PageSizes="@_appSettings.PageSizes"
                           ButtonCount="5"
                           Adaptive="true">
        </GridPagerSettings>
    </GridSettings>
    <GridToolBarTemplate>
        <GridCommandButton Command="custom" Icon="@FontIcon.MaxWidth" Size="sm" OnClick="@(() => Grid.AutoFitAllColumns())">Auto-fit</GridCommandButton>
        <span class="k-toolbar-spacer"></span>
        <GridCommandButton Command="ExcelExport" Icon="@FontIcon.FileExcel" Size="sm">To Excel</GridCommandButton>
        <span title="Searches the items in the below grid." class="tooltip">
            <GridSearchBox DebounceDelay="200" Placeholder="Search" Size="sm" Fields="@SearchFields"></GridSearchBox>
        </span>
    </GridToolBarTemplate>
    <GridColumns>
        @if (GridData != null && GridData.Any())
        {
            var firstItem = GridData.First();
            var dictionaryItem = (IDictionary<string, object>)firstItem;

            var fields = dictionaryItem.Keys;

            foreach (var item in dictionaryItem)
            {
                <GridColumn Field="@item.Key" FieldType="@typeof(string)"></GridColumn>
            }
        }
    </GridColumns>
</TelerikGrid>

<TelerikGrid Data=@infosEmplacementSource
        Class="@theGridClass"
        @bind-SelectedItems="@SelectedItems_"
....

string theGridClass { get; set; } = "theSpecialGrid";

public async Task EmplacementSubmitHandler()
{
    emplacementMessageStore?.Clear();
    infosEmplacementsTelerikDialog.FicheEspaceClosId= ficheEspaceClosId;

    var (success, added, error) = await AdditionalInformationDataService.AjoutertlkpEmplacementAsync(infosEmplacementsTelerikDialog, CultureInfo.DefaultThreadCurrentCulture.Name.ToString());
    if (success)
    {
        infosEmplacementSource.Insert(0, new treltlkpEmplacementViewModel
        {
            tlkpEmplacementId = added.tlkpEmplacementId
     
        });
        CloseTelerikDialogAddEmplacementSource();
        SelectedItems_ = infosEmplacementSource.Where(item => item.tlkpEmplacementId == added.tlkpEmplacementId).ToList();
        await Task.Delay(20);//rougly one rendering frame so this has the chance to render in the browser
        await _jsRuntime.InvokeVoidAsync("scrollToSelectedRow", "." + theGridClass);

    }
..............

// this function takes a selector that describes the desired grid
// and then finds the first selected row, then scrolls to it
// via standard browser methods - effectively, the grid does not
// interact or implement this. Suitable for regular paging mode only, not for virtual scrolling
function scrollToSelectedRow(gridSelector) {
    var gridWrapper = document.querySelector(gridSelector);
    if (gridWrapper) {
        var selectedRow = gridWrapper.querySelector("tr.k-selected");
        if (selectedRow) {
            selectedRow.scrollIntoView();
        }
    }
}

<TelerikDialog @bind-Visible="@DialogVisible"
               Width="500px"   
               ShowCloseButton="false"
               CloseOnOverlayClick="false">
    <DialogTitle>Updating</DialogTitle>
    <DialogContent>
        <p>Assigning stuff...</p>
         <TelerikProgressBar Value="@ProgressValue" Max="100"></TelerikProgressBar>
    </DialogContent>
</TelerikDialog>

@code {
	private bool DialogVisible { get; set; } = false;
	private double ProgressValue = 0;

	private async void ButtonClick()
	{
		DialogVisible = true;

		for (var i = 0; i < 20; i++)
		{
			ProgressValue = Math.Round((double)i / 20 * 100);
			StateHasChanged();
			await Task.Delay(1000);
		}
	}
}