How do I disable Ctrl+S behavior in RadSpreadsheet and RichTextEditor of Winforms?

        public RadForm1()
        {
            InitializeComponent();

            this.radSpreadsheet1.SpreadsheetElement.InputHandler = new CustomSpreadsheetInputBehavior(this.radSpreadsheet1.SpreadsheetElement);
        }
        
        public class CustomSpreadsheetInputBehavior : SpreadsheetInputBehavior
        {
            public CustomSpreadsheetInputBehavior(RadSpreadsheetElement spreadsheet) : base(spreadsheet)
            {
            }

            public override void ProcessKeyDown(KeyEventArgs e)
            {
                if (e.Control && e.KeyCode == Keys.S)
                {
                    return;
                }
                base.ProcessKeyDown(e);
            }
        }

            this.radRichTextEditor1.CommandExecuting += radRichTextEditor1_CommandExecuting;

        private void radRichTextEditor1_CommandExecuting(object sender, Telerik.WinForms.Documents.RichTextBoxCommands.CommandExecutingEventArgs e)
        {
            if (e.Command is SaveCommand)
            {
                e.Cancel = true;
            }
        }