# PageViewSpaceChangeEventArgs class

Namespace: [Rhino.Display](https://developer.rhino3d.com/api/rhinocommon/namespace/rhino.display.md) · Assembly: [RhinoCommon](https://developer.rhino3d.com/api/rhinocommon/assembly/rhinocommon.md) · Since v5.0

```cs
public class PageViewSpaceChangeEventArgs : EventArgs
```

PageView space change event arguments.

## Properties

- [NewActiveDetailId](https://developer.rhino3d.com/api/rhinocommon/type/rhino.display.pageviewspacechangeeventargs/newactivedetailid.md): The id of the detail object was set active. Note, if this id is equal to Guid.Empty, then the active detail object is the page view itself.
- [OldActiveDetailId](https://developer.rhino3d.com/api/rhinocommon/type/rhino.display.pageviewspacechangeeventargs/oldactivedetailid.md): The id of the previously active detail object. Note, if this id is equal to Guid.Empty, then the active detail object was the page view itself.
- [PageView](https://developer.rhino3d.com/api/rhinocommon/type/rhino.display.pageviewspacechangeeventargs/pageview.md): The page view on which a different detail object was set active.