Hi Elsa,
We are glad to inform you that this feature, for hiding sheet tabs in a workbook has been implemented in our latest version 4.2.0.37.
Please use the following code to hide the sheet tabs in a workbook.
//Hiding the sheet tabs of a workbook.
workbook.DisplayWorkbookTabs=false;
Please take a look at the sample for your reference.Sample:
HidingSheetTabs.zip
Also please try to upgrade to our latest version 4.2.0.37 which has some features added.
Here is the download link for the latest version.DownloadLink: http://www2.syncfusion.com/Installs/v4.2.0.37/SyncfusionEssentialStudioSetup.exe
Note: This version requires a separate key to install. Please contact sales if you have not received a key.
Please take a look at the attachment and let me know if you need any assistance.
Thanks,
Bharath