* given type within the specified region, in the context of
* the given project.
*/
public CreateTypeHierarchyOperation(IRegion region, ICompilationUnit[] workingCopies, IType element, boolean computeSubtypes) {
super(element);
this.typeHierarchy = new RegionBasedTypeHierarchy(region, workingCopies, element, computeSubtypes);
}