Hide Close Button Excel 2007

[chovatia.jaydeep]

Hi,

I want to hide Minimize/Maximize/Close("X") buttons of an Excel
sheet(2007) which appears on title bar. To hide the buttons
programmatically, i write following code:

Please assume that my excel sheet is opened on desktop whose caption
is: "EXCELSHEET_TEST"

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HWND hwndExcelHandler = FindWindow(NULL, "EXCELSHEET_TEST");
DWORD dwStyle = GetWindowLong(hwndExcelHandler, GWL_STYLE);
::SetWindowLong(hwndExcelHandler, GWL_STYLE, (dwStyle &
~WS_MAXIMIZEBOX));

dwStyle = GetWindowLong(hwndExcelHandler, GWL_STYLE);
::SetWindowLong(hwndExcelHandler, GWL_STYLE, (dwStyle &
~WS_MINIMIZEBOX));

HMENU hMenuOfXLS = ::GetSystemMenu(hwndExcelHandler, false);
:eleteMenu(hMenuOfXLS, SC_CLOSE, MF_BYCOMMAND); //ok actually
remove the close button
------------------------------------------------------------------------------------------------------------

This code successfully hides MINIMIZE and MAXIMIZE buttons, but it
doesn't hide CLOSE("X") button appears on title bar.

I tried testing it with Excel 2003 and it gives me expected results.
It hides all of three buttons MINIMIZE/MAXIMIZE/CLOSE of Excel 2003
titlebar.

Can anyone please suggest me why this code doesn't works for Excel
2007?

Any suggestion on the same would be appreciated.

Thank You,
Jaydeep