public Form1()
{
    KeyPreview = true;
    InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
    FarPoint.Win.Spread.FpSpread customSpread = new CustomSpread(FarPoint.Win.Spread.LegacyBehaviors.None);
    customSpread.Location = new System.Drawing.Point(0, 0);
    customSpread.Name = "fpSpread1";
    customSpread.Sheets.Count = 1;
    customSpread.Size = new System.Drawing.Size(500, 500);
    this.Controls.Add(customSpread);

    customSpread.Sheets[0].OperationMode = FarPoint.Win.Spread.OperationMode.RowMode;
    customSpread.Sheets[0].Columns[0].CellType = new FarPoint.Win.Spread.CellType.CheckBoxCellType();
}


public class CustomSpread : FarPoint.Win.Spread.FpSpread
{
    public CustomSpread(FarPoint.Win.Spread.LegacyBehaviors legacyBehaviors) : base(legacyBehaviors) { }
            
    protected override void OnKeyPress(KeyPressEventArgs e) { }
    protected override void OnKeyDown(KeyEventArgs e) { }
    protected override void OnKeyUp(KeyEventArgs e) { }
    protected override bool IsInputKey(Keys keyData) => false;
    protected override bool ProcessDialogKey(Keys keyData) => false;
}