Create an empty project with a RadSpreadsheet. Hide column A and B and try to scroll:
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)