切换perspective

关闭当前perspective，并打开一个新的perspective:

IWorkbench workbench = PlatformUI.getWorkbench();
        IPerspectiveRegistry pr = workbench.getPerspectiveRegistry();
        IPerspectiveDescriptor persdes = pr
                .findPerspectiveWithId(OWLPerspective.ID);
        WorkbenchPage page = (WorkbenchPage) workbench
                .getActiveWorkbenchWindow().getActivePage();
        Perspective persp = page.getActivePerspective();
        page.closePerspective(persdes, false, false);
        try {
            workbench.showPerspective(RelexoPerspective.ID, workbench
                    .getActiveWorkbenchWindow());
        } catch (WorkbenchException e) {
            e.printStackTrace();
        }