secondaryBuilder property

The secondary widget to be displayed. If not provided, the default chevron down icon is displayed.

Example:

SplitButton(
  child: Text('Split Button'),
  // invoke [showFlyout] to show the flyout, or use the flyoutController
  // to display a flyout with custom options
  secondaryBuilder: (context, showFlyout, flyoutController) {
    return IconButton(
      icon: const ChevronDown(),
      onPressed: showFlyout,
    );
  },
  flyout: Container(
    width: 200,
    height: 200,
    color: Colors.white,
  ),
),

See also:

• ChevronDown, the default icon used
• flyout, the widget to be displayed when the flyout is requested