Can the Ctrl + A key combination only select used cells?

public partial class RadForm1 : Telerik.WinControls.UI.RadForm
{
    public RadForm1()
    {
        InitializeComponent();

        radSpreadsheet1.InputHandler = new MyInputBehavior(this.radSpreadsheet1.SpreadsheetElement);
    }
}

class MyInputBehavior : SpreadsheetInputBehavior
{
    RadSpreadsheetElement spreadsheet;

    public MyInputBehavior(RadSpreadsheetElement spreadsheet) : base (spreadsheet)
    {
        this.spreadsheet = spreadsheet;
    }

    public override void ProcessKeyDown(System.Windows.Forms.KeyEventArgs e)
    {
        if (e.Control && e.KeyCode == Keys.A)
        {
            CellRange usedRange = this.spreadsheet.ActiveWorksheet.UsedCellRange;
            spreadsheet.ActiveWorksheetEditor.Selection.Select(usedRange);
            return;
        }
        base.ProcessKeyDown(e);
    }
}