> ## Documentation Index
> Fetch the complete documentation index at: https://docs.codenullapp.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Expandable component
> You must have an existing Datagrid.
* You must have an existing Datagrid.
* Next, open the settings of the Datagrid where you want to add the expandable row.
* Go to the "Additional settings" section where there is an option for "Nested table".
* In this section, add the components you need as you normally would, such as Datagrid, Form, etc.
* **Tip:** You can go to "Show JSON Editor", create the component directly there, and then paste it here, or finish it later in "Show JSON Editor".
* Important note: the data for the parent row is taken from "dataItem," and you can use it in the data sources.
* Then, simply go to the "Feature" and expand the row you need to test.
