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
if (fActionGroups != null)
            fActionGroups.dispose();
        super.dispose();
    }
    /**
     * Double click listener which jumps to the method in the source code.
     *
     * @return IDoubleClickListener
     */
    public void doubleClick(DoubleClickEvent event) {
        jumpToSelection(event.getSelection());
    }
    /**
     * Goes to the selected entry, without updating the order of history entries.
     */
    public void gotoHistoryEntry(IMethod entry) {
        if (fMethodHistory.contains(entry)) {
            setMethod(entry);
        }
    }
    /* (non-Javadoc)
     * Method declared on IViewPart.
     */
    public void init(IViewSite site, IMemento memento)
        throws PartInitException {
        super.init(site, memento);
        fMemento = memento;
    }
    public void jumpToDeclarationOfSelection() {
        ISelection selection = null;