I'm not exactly sure if you can do that, the TabBar relies on
a ViewStack and at least one view in the ViewStack would need to be
displayed upon loading it up. There are ways of working around that
assuming what you want done can't be done. You could instead use
buttons to display whatever view in a ViewStack using its click
event handler. Or if you're using states, change a state using the
click event handler of a button.