How to use a link bar or navigation bar for display only?

My app has a link bar in an Application Control bar that is bound to the view stack of the steps in my application.
I would like to use this as a mechanism to show the user which step he is on and how many are left, but NOT to click on it to navigate between steps.  I have provided wizard-like buttons to step navigation.
How can I have the link bar not respond to clicks, or, if not, programmatically disable certain steps in it (e.g. "step 2" not available until I say so)?

OK, I have decided it might be easier to use a repeater with buttons in it, such as:
<mx:Repeater id="toolbar" dataProvider="{dataXML}" >
<mx:Button label="{toolbar.currentIndex+1}. {toolbar.currentItem..stepTitle}" enabled="false" />
</mx:Repeater>
So now I'd like to progressively change the buttons in the repeater to "enabled" as I am ready.
However, toolbar.getChildAt(0).enabled = true fails with:
1119: Access of possibly undefined property enabled through a reference with static type flash.display:DisplayObject.

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