public RadForm1()
        {
            InitializeComponent();
            this.radSpreadsheet1.SpreadsheetElement.ActiveWorksheetEditor.MouseClick += ActiveWorksheetEditor_MouseClick;
        }

        private void ActiveWorksheetEditor_MouseClick(object sender, Telerik.WinControls.Spreadsheet.UI.MouseButtonEventArgs e)
        {
            Console.WriteLine(DateTime.Now.ToLongTimeString());
            var selection = this.radSpreadsheet1.SpreadsheetElement.ActiveWorksheetEditor.Selection.ActiveRange;
            if (!selection.IsColumnRange)
            {
            }
        }

this.radSpreadsheet1.ActiveWorksheetEditor.FreezePanes(new CellIndex(10, 3));

foreach (var worksheet in this.radSpreadsheet1.Workbook.Worksheets)
{
      worksheet.ViewState.FreezePanes(5, 5);
}

System.IndexOutOfRangeException: Index was outside the bounds of the array.
   at Telerik.Windows.Documents.Spreadsheet.Layout.RadWorksheetLayout.GetColumnWidth(Int32 columnIndex)
   at Telerik.WinForms.Controls.Spreadsheet.Worksheets.RadWorksheetEditorPresenterBase.SetHorizontalOffsetInternal(ScrollEventType scrollType, Double value)
   at Telerik.WinForms.Controls.Spreadsheet.Worksheets.RadWorksheetEditor.SetHorizontalOffsetInternal(ScrollEventType scrollType, Double value)
   at Telerik.WinControls.UI.RadSpreadsheetElement.ScrollBar_Scroll(Object sender, ScrollEventArgs e)
   at System.Windows.Forms.ScrollEventHandler.Invoke(Object sender, ScrollEventArgs e)
   at Telerik.WinControls.UI.RadScrollBarElement.OnScroll(ScrollEventArgs args)
   at Telerik.WinControls.UI.RadScrollBarElement.CallOnScroll(ScrollEventType scrollType, Int32 oldValue, Int32 newValue)
   at Telerik.WinControls.UI.RadScrollBarElement.ScrollWith(Int32 step, ScrollEventType scrollType)
   at Telerik.WinControls.UI.RadScrollBarElement.OnScrollTimer(Object sender, EventArgs e)
   at Telerik.WinControls.UI.RadScrollBarElement.OnMouseDown(MouseEventArgs e)
   at Telerik.WinControls.RadElement.OnCLREventsRise(RoutedEventArgs args)
   at Telerik.WinControls.RadElement.OnBubbleEvent(RadElement sender, RoutedEventArgs args)
   at Telerik.WinControls.RadElement.RaiseBubbleEvent(RadElement sender, RoutedEventArgs args)
   at Telerik.WinControls.RadItem.RaiseBubbleEvent(RadElement sender, RoutedEventArgs args)
   at Telerik.WinControls.RadElement.RaiseBubbleEvent(RadElement sender, RoutedEventArgs args)
   at Telerik.WinControls.RadItem.RaiseBubbleEvent(RadElement sender, RoutedEventArgs args)
   at Telerik.WinControls.RadElement.RaiseRoutedEvent(RadElement sender, RoutedEventArgs args)
   at Telerik.WinControls.RadElement.DoMouseDown(MouseEventArgs e)
   at Telerik.WinControls.ComponentInputBehavior.OnMouseDown(MouseEventArgs e)
   at Telerik.WinControls.Spreadsheet.UI.RadSpreadsheetComponentInputBehavior.OnMouseDown(MouseEventArgs e)
   at Telerik.WinControls.RadControl.OnMouseDown(MouseEventArgs e)
   at System.Windows.Forms.Control.WmMouseDown(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   at Telerik.WinControls.RadControl.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)