# IPanel interface

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

```cs
[CLSCompliant(false)]
public interface IPanel
```

Implement this interface when you want to be notified of when a panel is shown, hidden or closed.

## Methods

- [PanelClosing](https://developer.rhino3d.com/api/rhinocommon/type/rhino.ui.ipanel/panelclosing.md)
- [PanelHidden](https://developer.rhino3d.com/api/rhinocommon/type/rhino.ui.ipanel/panelhidden.md)
- [PanelShown](https://developer.rhino3d.com/api/rhinocommon/type/rhino.ui.ipanel/panelshown.md)