Axolot Data

I would like to know how I can determine whether an Excel sheet is visible or hidden.
Could not find a property or function of TXLSWorksheet which gives me this information.

Thanks in advance.

Meanwhile I found it.

TXLSWorksheet.Visibility

Unfortunately the value of 'Visibility' is always 'x12vVisible' after calling 'Read'.
What is to be done to get the correct value of 'Visibility'?