tbm.add(showOverviewAction);
showPage(ID_OUTLINE);
}
public void createControl(Composite parent){
pageBook = new PageBook(parent, SWT.NONE);
outline = getViewer().createControl(pageBook);
overview = new Canvas(pageBook, SWT.NONE);
pageBook.showPage(outline);
configureOutlineViewer();
hookOutlineViewer();