要使AnimatedContainer和Row一起进行动画处理，需要将它们包装在AnimatedBuilder中。下面是代码示例：

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State {
  bool _isExpanded = false;

  @override
  Widget build(BuildContext context) {
    return AnimatedBuilder(
      animation: _animationController,
      builder: (BuildContext context, Widget child) {
        return Row(
          children: [
            SizedBox(
              width: 50.0,
              child: IconButton(
                onPressed: () {
                  setState(() {
                    _isExpanded = !_isExpanded;
                  });
                },
                icon: Icon(Icons.info),
              ),
            ),
            Expanded(
              child: AnimatedContainer(
                duration: const Duration(milliseconds: 500),
                width: _isExpanded ? 200.0 : 100.0,
                height: _isExpanded ? 200.0 : 100.0,
                color: _isExpanded ? Colors.red : Colors.blue,
                child: Center(
                  child: Text('Hello World'),
                ),
              ),
            ),
          ],
        );
      },
    );
  }
}

在上面的代码示例中，我们将AnimatedContainer包装在AnimatedBuilder中，并将其子项设置为Row。这样可以确保AnimatedContainer和Row一起进行动画处理。在setState中更改_isExpanded变量，从而根据需要切换显示AnimatedContainer的宽度，高度和颜色。