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/CallHierarchyFiltersActionGroup.java
}
    /* (non-Javadoc)
     * Method declared on ActionGroup.
     */
    public void fillActionBars(IActionBars actionBars) {
        fillToolBar(actionBars.getToolBarManager());
        fillViewMenu(actionBars.getMenuManager());
    }
    private void fillToolBar(IToolBarManager toolBar) {
    }
    private void fillViewMenu(IMenuManager viewMenu) {
        viewMenu.add(new Separator("filters")); 
        viewMenu.add(new ShowFilterDialogAction());
    }
    /* (non-Javadoc)
     * Method declared on ActionGroup.
     */
    public void dispose() {
        super.dispose();
    }
    
    
    private void openDialog() {
        FiltersDialog dialog= new FiltersDialog(
            fPart.getViewSite().getShell());
        
        dialog.open();
    }
}