What are Detail Grids?
In previous Extender releases, there were Resources called Detail Windows and Detail Forms. In Extender 2013, these resources have been combined into the Windows and Forms resources.
With Extender 2013, the detail grid option will combine the Windows and Detail Windows as well as the Forms and Detail Forms together. By doing this, you can header and detail information together on a Windows. This was available on Detail Forms previously, but not on Windows. You can have up to 15 header fields as well as up to 10 detail fields on the same window or form.
If you will be updating data from a previous Extender release to Extender 2013, all existing setups from the Detail Windows and Detail Forms will be as Windows and Forms utilizing the Scrolling Grid Option and the data will be linked to the new Window or Form.