How do I create a TTMSFMXGrid hidden column?

I've been using FMXGrid and am quite impressed with all the features.  I still have much to learn.  The Developers Guide mentions:

Options.ExportHiddenColumns: Boolean;
When true, hidden columns are also exported

I can't find anything else about hidden columns.  How do I create a hidden column, or hide an existing column?  Thanks in advance.

You can hide a column with TMSFMXGrid1.HideColumn(Col: Integer)

Thanks Pieter.  Is there a document that lists functions like HideColumn() that are not in the Developer's Guide?

Is there a way to test if a column is hidden?