# GH_MessageWidget.WidgetVisibleChangedEventHandler delegate

Namespace: [Grasshopper.GUI.Widgets](https://developer.rhino3d.com/api/gh1/namespace/grasshopper.gui.widgets.md) · Assembly: [Grasshopper](https://developer.rhino3d.com/api/gh1/assembly/grasshopper.md)

```cs
public delegate GH_MessageWidget.WidgetVisibleChangedEventHandler
```

**Signature:**

```cs
void GH_MessageWidget.WidgetVisibleChangedEventHandler()
```