Stop Change Event in TabNavigator

How can I stop the change event from happening on a
TabNavigator?
I have a TabNavigator with two tabs. I want to be able to
detect when the user clicks on the non-active tab then check
certain components on the active tab and then depending on the
components either let the user to go to the non-active tab or not.
I have tried using the change event but I can not stop the
tab from actually changing. Is there another event which gets fired
before the change event that I can use?
I have tried using:
event.preventDefault();
event.stopImmediatePropagation();
event.stopPropagation();
But none of them stop the tab change.

I would use a TabBar with a ViewStack instead, that way when
you click on the TabBar you can programmatically tell it what to
do.

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