message: resets layout on each button tap
diff: @@ -78,6 +78,10 @@ export default class ScrollableTabBar extends React.Component<ScrollableTabBarPr
  accessible={true}
  accessibilityLabel={name}
  accessibilityTraits="button"
  + onLayout={e => {
  + const layout = e.nativeEvent.layout
  + this.els[page] = layout
  + }}
  onPress={() => {
  this.setState({
  activeTab: page,
  