extraButton property
Optional extra button displayed beside the tab bar.
Typically used for a primary action like "Create", "Add", or "Compose". Defaults to the right side; set GlassTabBarExtraButton.placement to GlassExtraButtonPlacement.left to place it before the tab pill. The button is rendered as a GlassButton and inherits the glass settings.
Implementation
final GlassTabBarExtraButton? extraButton;