stop closing a worksheet unless press a button

[bbt]

I have a problem regarding stopping user to close a file unless the user press a button with macro embeded. The macro triggers to hide just one worksheet but not the others. When the user re-opens the file, he needs to press a button with password in order to read the worksheet being hidden.
Is it very difficult? I am a beginner of Excel VBA. It would be very appreciated if you can help me and explain to me with an example.
With many thanks in advance.

[lucas]

Why not put your code to hide the one worksheet in the thisworkbook module using a before close event. Then it would not matter how they close the workbook the event would run and the sheet would be hidden.