How to use 2 level tabs? especially parent tab

Hi all.
I use APEX 4.0 and theme 17 Sapphire.
I have two pages: A , B.
When I run page A,I want to show it like this:
||Parent Tab1||Parent Tab2||
||tab1||
When I run page B,I want to show it like this:
||Parent Tab1||Parent Tab2||
||tab2||
tab1 belongs to Parent Tab1, tab2 belongs to Parent Tab2. Show the parent tab all the time.
But now When I run page B. the parent tab disappears. Why?
I check the two pages in Tree View. I find differences in the Shared Componts -> Parent Tabs area. Page A's Tab Set is main and has two parent tabs. But B's Tab Set is the one I created and just has one parent tab. So how to change it?
Steps are the best.
Thank you all.
The second question is how to beatify parent tabs?
Edited by: AndyChou on Feb 28, 2011 5:45 PM

Hello -
http://proskudin.blogspot.com/2007/06/two-level-tabs.html check out this blog. This is what I used to help me understand two level tabs. It is actually quite a good reference.
Austin

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How to use 2 level tabs? especially parent tab

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