# ICollapsibleSection2 interface

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

```cs
public interface ICollapsibleSection2
```

## Methods

- [EnableHeaderButton](https://developer.rhino3d.com/api/rhinocommon/type/rhino.ui.controls.icollapsiblesection2/enableheaderbutton.md)
- [NewHeaderButtonHandler](https://developer.rhino3d.com/api/rhinocommon/type/rhino.ui.controls.icollapsiblesection2/newheaderbuttonhandler.md)
- [OnAttachedToHolder](https://developer.rhino3d.com/api/rhinocommon/type/rhino.ui.controls.icollapsiblesection2/onattachedtoholder.md)
- [OnAttachingToHolder](https://developer.rhino3d.com/api/rhinocommon/type/rhino.ui.controls.icollapsiblesection2/onattachingtoholder.md)
- [OnDetachedFromHolder](https://developer.rhino3d.com/api/rhinocommon/type/rhino.ui.controls.icollapsiblesection2/ondetachedfromholder.md)
- [OnDetachingFromHolder](https://developer.rhino3d.com/api/rhinocommon/type/rhino.ui.controls.icollapsiblesection2/ondetachingfromholder.md)
- [ShowHeaderButton](https://developer.rhino3d.com/api/rhinocommon/type/rhino.ui.controls.icollapsiblesection2/showheaderbutton.md)