# IUserInterfaceSection interface

Namespace: [Rhino.Render.UI](https://developer.rhino3d.com/api/rhinocommon/namespace/rhino.render.ui.md) · Assembly: [RhinoCommon](https://developer.rhino3d.com/api/rhinocommon/assembly/rhinocommon.md)

```cs
public interface IUserInterfaceSection
```

> **Obsolete:** Obsolete

Implement this interface in your user control to get UserInterfaceSection event notification.

## Properties

- [Hidden](https://developer.rhino3d.com/api/rhinocommon/type/rhino.render.ui.iuserinterfacesection/hidden.md): Return true if the section should be hidden, else return false.

## Methods

- [OnUserInterfaceSectionExpanding](https://developer.rhino3d.com/api/rhinocommon/type/rhino.render.ui.iuserinterfacesection/onuserinterfacesectionexpanding.md): The UserInterfaceSection object that called this interface method.
- [UserInterfaceDisplayData](https://developer.rhino3d.com/api/rhinocommon/type/rhino.render.ui.iuserinterfacesection/userinterfacedisplaydata.md): Called by UserInterfaceSection when the selected content changes or a content field property value changes.