Find usages example

I had written a plugin (for internal use) for IDEA 4.5 to help find JSP tags with a certain criteria.

Now with IDEA 7 the search and usages code have been refactored so that I cannot find my way around to upgrade the plugin. What I want is a plugin that adds custom searching of JSP tags (JspAction) to the Find usages command used on a plain Java method.

Is there any example I can look at? (The only ones I found related to custom languages, but this is a custom search for standard languages)
A specific problem is that I cannot find com.intellij.psi.jsp.JspAction anymore.

Thanks in advance.

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