addTab
Declares one tab of a Tabs row.
Parameters
id
Identifier matched against selectedTabId and carried by onTabItemClick when this tab is tapped.
label
Text shown for this tab. Defaults to none.
icon
Icon shown for this tab. Defaults to none.
badgeText
Badge attached to the icon (or the label when there's no icon) — empty string for a dot badge, any other value as text, null for no badge. Defaults to none.