# ObjectPropertiesPageCollection class

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
public class ObjectPropertiesPageCollection
```

Passed to Rhino.PlugIns.PlugIn.ObjectPropertiesPages to allow a plug-in to add custom ObjectPropertiesPage pages to the Rhino properties panel.

## Properties

- [Document](https://developer.rhino3d.com/api/rhinocommon/type/rhino.ui.objectpropertiespagecollection/document.md): Document associated with the Rhino properties panel.
- [DocumentRuntimeSerialNumber](https://developer.rhino3d.com/api/rhinocommon/type/rhino.ui.objectpropertiespagecollection/documentruntimeserialnumber.md): Document associated with the Rhino properties panel.

## Methods

- [Add](https://developer.rhino3d.com/api/rhinocommon/type/rhino.ui.objectpropertiespagecollection/add.md): Custom page to add