StackOverflowException assigning a bitmap to a cell value in DataGridView

Hi,

I want to display an icon in one column of a databound DataGridView.
For that I have applied the technique given in "How to: Customize Data Formatting in the Windows Forms DataGridView Control".
My code is below.

When running this with a moderate size dataset (200 rows), everything goes well.
However, when trying to load a larger dataset (2000 rows), after about 400 rows, I get a StackOverflowException right on the line where a bitmap is assigned to the cell value.
Note that I load the bitmaps from the resources.

Does this mean that the bitmaps are duplicated for each row they are used in making the application to go in StackOverflow?
Is there a cleaner way to work?
Thanks for your help in advance.

public Form1()
{
    InitializeComponent();

    ...

    circleGrayImage = MyAppNameSp.Properties.Resources.imr_CircleGray_16;
    circleGreenImage = MyAppNameSp.Properties.Resources.imr_CircleGreen_16;
    circleRedImage = MyAppNameSp.Properties.Resources.imr_CircleRed_16;
}

private void openToolStripButton_Click(object sender, EventArgs e)
{
    ...
    
    // Bind dsStringDataSet to dataGridView
    dataGridView.DataSource = dsStringDataSet;
    dataGridView.DataMember = "string";

    // Add unbound column for displaying icons
    DataGridViewImageColumn imageColumn = new DataGridViewImageColumn();
    imageColumn.Name = "icon";
    imageColumn.HeaderText = "";
    dataGridView.Columns.Insert(2, imageColumn);
    
    ...
}

private void dataGridView_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
    if (dataGridView.Rows.Count > 1)
    {
        if (dataGridView.Columns[e.ColumnIndex].Name.Equals("icon"))
        {
            DataGridViewCell iconCell = dataGridView["icon", e.RowIndex];
            iconCell.Style.NullValue = null;
            String stringValue = dataGridView[sTargetLangCodeTS, e.RowIndex].Value as string;

            switch (stringValue)
            {
                case sTS_Translated:
                    iconCell.Value = circleGreenImage; // <<< StackOverflowException here
                    iconCell.ToolTipText = "Translated";
                    break;
                case sTS_Untranslated:
                    iconCell.Value = circleRedImage;
                    iconCell.ToolTipText = "Untranslated";
                    break;
                case sTS_NotNeeded:
                    iconCell.Value = circleGrayImage;
                    iconCell.ToolTipText = "No translation needed";
                    break;
                default:
                    iconCell.Value = null;
                    iconCell.ToolTipText = String.Empty;
                    break;
            }
        }
    }
}

StackOverflowException assigning a bitmap to a cell value in DataGridView_CellFormatting

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