switchTo method
Implementation
void switchTo(int index) {
if (index == activeTabIndex) return;
var event = TabChangeEvent(activeTabIndex, index);
_beforeTabChange.add(event);
if (event.defaultPrevented) return;
activeTabIndex = index;
_tabChange.add(event);
_activeTabIndexChange.add(activeTabIndex);
focusController?.setTabbable(activeTabIndex);
}