From Xojo Documentation
The actual cell data for the section and row.
|table||The iOSTable instance using this data source.|
|section||This is the section that has been requested.|
|row||This is the row within the section that has been requested.|
You will need to create an iOSTableCellData instance and populate it with the values from your data source to return it from this method.
Refer to the data source example in the User Guide to see how to set up a Data Source that returns names, with sections for the first letter of each last name.
You can also refer to the sample project included with Xojo: