shows problems:<br />
<TelerikButton @onclick=@(e=>setData(1))>First Data Set</TelerikButton>
<TelerikButton @onclick=@(e=>setData(2))>Second Data Set</TelerikButton>
<TelerikButton @onclick=@(e=>setData(3))>Third Data Set</TelerikButton>

<br />
should work:<br />
<TelerikButton OnClick="@ClearSeries">Clear series</TelerikButton>
<TelerikButton OnClick="@ClearSeries2">Clear series and Generete first set of data (4 series)</TelerikButton>


@if (ChartVisible)
{
    <TelerikChart>
        <ChartSeriesItems>
            @foreach (Tuple<string, object[]> t in myData)
            {
                <ChartSeries Type="ChartSeriesType.Column" Name=@t.Item1 Data=@t.Item2 />
            }
        </ChartSeriesItems>
        <ChartCategoryAxes>
            <ChartCategoryAxis Categories=@xAxisItems />
        </ChartCategoryAxes>
        <ChartTitle Text="Yearly Data" />
        <ChartLegend Position="Telerik.Blazor.ChartLegendPosition.Bottom" />
    </TelerikChart>
}

@code {
    bool ChartVisible { get; set; } = true;
    async Task ClearSeries()
    {
        myData.Clear();
        ChartVisible = false;
        await Task.Delay(30);
        ChartVisible = true;
        StateHasChanged();
    }

    async Task ClearSeries2()
    {
        await ClearSeries();
        setData(1);
    }

    List<Tuple<string, object[]>> myData = new List<Tuple<string, object[]>>();
    public string[] xAxisItems = new string[] { "Q1", "Q2", "Q3", "Q4" };

    protected override async Task OnInitializedAsync()
    {
        setData(3);
    }

    void setData(int offset)
    {
        myData.Clear();
        switch (offset)
        {
            case 1:
                {
                    myData = buildList(4);
                    break;
                }
            case 2:
                {
                    myData = buildList(8);
                    break;
                }
            case 3:
                {
                    myData = buildList(6);
                    break;
                }
        }

        List<Tuple<string, object[]>> buildList(int itemCount)
        {
            List<Tuple<string, object[]>> tempList = new List<Tuple<string, object[]>>();
            Tuple<string, object[]> tempTuple;
            Random rand = new Random();
            object[] tempData;

            for (int i = 0; i < itemCount; i++)
            {
                tempData = new object[4];
                for (int j = 0; j < 4; j++)
                {
                    tempData[j] = rand.Next(100);
                }
                tempTuple = new Tuple<string, object[]>("Item " + i, tempData);
                tempList.Add(tempTuple);
            }
            return tempList;

        }

    }
}