I read the pages.dtd to find the action element and got it working with that.
Here is how I did it:
1. Add a String property "selectedTab" to the backing EntityHome of the main
page;
2. In each child page's Seam page config XML (child.page.xml), add an action
element that calls "setSelectedTab('value')";
3. On the main page, using EL to value the selectedTab property of the
rich:tabPanel tag.
I feel that introducing one more property in the backing bean may not be
necessary (it also pollutes the EntityHome). I would imagine there be a way to
pass parameters around the pages and use their values in EL, but I don't know
how. I saw that in pages.dtd, there are also "in" and "out" elements, wonder if
these can do exactly what I wanted, but couldn't find their description/usage
on the reference doc. Any clarification/education?
Thanks.
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