# Application.ICallback interface

Namespace: [Eto.Forms](https://eto.picoe.ca/api/namespace/eto.forms.md) · Assembly: [Eto](https://eto.picoe.ca/api/assembly/eto.md)

```cs
public interface Application.ICallback : Widget.ICallback
```

Interface for callbacks to the [Application](https://eto.picoe.ca/api/type/eto.forms.application.md) class

**Derived types:** [Application.Callback](https://eto.picoe.ca/api/type/eto.forms.application.callback.md)

## Methods

- [OnInitialized](https://eto.picoe.ca/api/type/eto.forms.application.icallback/oninitialized.md): Raises the initialized event.
- [OnIsActiveChanged](https://eto.picoe.ca/api/type/eto.forms.application.icallback/onisactivechanged.md): Raises the IsActiveChanged event.
- [OnNotificationActivated](https://eto.picoe.ca/api/type/eto.forms.application.icallback/onnotificationactivated.md): Raises the notification activated event.
- [OnTerminating](https://eto.picoe.ca/api/type/eto.forms.application.icallback/onterminating.md): Raises the terminating event.
- [OnThemeChanged](https://eto.picoe.ca/api/type/eto.forms.application.icallback/onthemechanged.md): Raises the [Application.ThemeChanged](https://eto.picoe.ca/api/type/eto.forms.application/themechanged.md) event.
- [OnUnhandledException](https://eto.picoe.ca/api/type/eto.forms.application.icallback/onunhandledexception.md): Raises the unhandled exception event.