TabEnabled property not working

There are some text fields dynamically added to a MovieClip. The text field's property such as text.type, backgroundColor, etc have been set for each text field dynamically created when clicked on the 'add emails' link.

But I am having problem with the tabEnabled property of the text field. Inspite of setting the tabEnabled property to true it doesn't work.

On pressing the tab key it highlights a component of the movieclip(to which text fields are dynamically added)'s parent.

What might be the reason behind it?
Any help is greatly appreciated.

I haven't used that property before, but perhaps you need to also specify tabIndex?

Yes, tabIndex is the property I was looking into to set the index for each of the text field.
Thanks.