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
private static final int PAGE_VIEWER = 1;
    private Label fNoHierarchyShownLabel;
    private PageBook fPagebook;
    private IDialogSettings fDialogSettings;
    private int fCurrentOrientation;
    private int fCurrentCallMode;
    private int fCurrentJavaLabelFormat;
    private MethodWrapper fCalleeRoot;
    private MethodWrapper fCallerRoot;
    private IMemento fMemento;
    private IMethod fShownMethod;
    private SelectionProviderMediator fSelectionProviderMediator;
    private List fMethodHistory;
    private TableViewer fLocationViewer;
    private Menu fLocationContextMenu;
    private SashForm fHierarchyLocationSplitter;
    private SearchScopeActionGroup fSearchScopeActions;
    private ToggleOrientationAction[] fToggleOrientationActions;
    private ToggleCallModeAction[] fToggleCallModeActions;
    private ToggleJavaLabelFormatAction[] fToggleJavaLabelFormatActions;
    private CallHierarchyFiltersActionGroup fFiltersActionGroup;
    private HistoryDropDownAction fHistoryDropDownAction;
    private RefreshAction fRefreshAction;
    private OpenLocationAction fOpenLocationAction;
    private FocusOnSelectionAction fFocusOnSelectionAction;
    private CompositeActionGroup fActionGroups;
    private CallHierarchyViewer fCallHierarchyViewer;
    private boolean fShowCallDetails;
    public CallHierarchyViewPart() {
        super();