Bug 36518 call hierarchy: 'refresh' should available only in dropdown menu
toolbar button is not conventional and not accessible we should remove it from there and put in the dropdown menu (context menu is ok, i guess)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/callhierarchy/CallHierarchyViewPart.java
getSite().setSelectionProvider(fSelectionProviderMediator);
        makeActions();
        fillViewMenu();
        fillActionBars();
        initOrientation();
        initCallMode();
        initJavaLabelFormat();
        if (fMemento != null) {
            restoreState(fMemento);
        }
        
        initDragAndDrop();      
    }
    /**
     * @param PAGE_EMPTY
     */
    private void showPage(int page) {
        if (page == PAGE_EMPTY) {
            fPagebook.showPage(fNoHierarchyShownLabel);
        } else {
            fPagebook.showPage(fHierarchyLocationSplitter);
        }
        enableActions(page != PAGE_EMPTY);
    }
    /**
     * @param b
     */
    private void enableActions(boolean enabled) {
        fLocationContextMenu.setEnabled(enabled);