[Name] showBreadcrumb [Type] boolean [Description] 
A boolean value indicating whether to display the “breadcrumb control”. The breadcrumb control shows the current center location’s geography hierarchy. For example, if the location center is Seattle, the breadcrumb control displays “World . United States . WA”. The default value is false. The breadcrumb control displays best when the width of the map is at least 300 pixels. This property can only be set when using the Map constructor.