# GH_Document.DefaultSelectedPreviewColourChangedEventHandler delegate

Namespace: [Grasshopper.Kernel](https://developer.rhino3d.com/api/gh1/namespace/grasshopper.kernel.md) · Assembly: [Grasshopper](https://developer.rhino3d.com/api/gh1/assembly/grasshopper.md)

```cs
public delegate GH_Document.DefaultSelectedPreviewColourChangedEventHandler
```

**Signature:**

```cs
void GH_Document.DefaultSelectedPreviewColourChangedEventHandler(Color colour)
```

**Parameters:**

- `colour` ([Color](https://learn.microsoft.com/dotnet/api/system.drawing.color))