# Getting started

The following is an empty Agera application:

```
package {
    import agera.core.*;
    import flash.events.*;

    public class MainApplication extends AgeraApplication {
        public function MainApplication() {
            super();
            this.addEventListener(Event.ADDED_TO_STAGE, this.initialize);
        }
        
        private function initialize(event: Event): void {
            // Action
        }
    }
}
```

## Default theme

It may be desired to listen to updates on the default UI theme when assigning the application's `defaultTheme` property to cause skin updates. Do so by calling `initializeDefaultTheme()` passing the desired display object.

```
this.initializeDefaultTheme(object);
```