used to override default classes with new ones
class CustomTopBar extends filemanager.views.topbar{
  // custom logic
}
 
webix.ui({
    view: "filemanager",
    url: "//localhost:3200/",
    override: new Map([
        [fileManager.views.topbar, CustomTopBar]
    ]),
});
The override property is designed for customizing inner views and services.
It allows setting the Map with a 2D array each, element of which is an array that stores: