Hide Insert New Sheet button in excel 2007

See more:

C#

WinForms

MS-Excel

I have a winform application that contains an excel viewer in one of its forms.It lets user to open and modify excel files. but i want to avoid users to create any new sheets,
so i need to know :

How can i get rid of the last tab of workbook tabs that allows user to add new sheet?

http://i.stack.imgur.com/E8K6V.png[^](I have tried a lot to insert the image of the button here but the code project editor convert < and > characters to something else.However i can see my image in preview panel very well!!!!)

I have found the following code to unvisible the button in the above image:

ExcelViewer1.Application.CommandBars["Workbook tabs"].Controls["Sheet List"].Visible = false;

But it thrown a COMException : "Error HRESULT E_FAIL has been returned from a call to a com component".

The same command works for other commandbars like Ply, Cell.