Another approach is to open the "Hierarchy View" menu in the "View" menu, select "Select a working set" and select an existing or new working set that includes only the project you are interested in (create it only for this purpose, if necessary, for example, it is called " TypeHierarchyFilterWorkingSet ").
I just did it using Eclipse Indigo, by the way, not sure if there is anything similar in other versions.
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