# ConvexAppBar

## change active tab

- https://github.com/hacktons/convex_bottom_bar/blob/master/doc/issue-change-active-tab-index.md

```dart
// define field instance
GlobalKey<ConvexAppBarState> _appBarKey = GlobalKey<ConvexAppBarState>();
// construct with key
ConvexAppBar(key: _appBarKey, /* ... */);
// access related State when necessary such as onPageChanged
_appBarKey.currentState.animateTo(2/* index*/);
```