How to highlight the selected SidebarLink in Sidebar, such as using Color.Primary

[wartim]

1 How to highlight the selected SidebarLink in Sidebar, such as using Color.Primary
2 The ElementId attribute is not very useful for nested encapsulated components. Should it be able to mark the "id" of the outermost http element when it shows that it can be set. For example, run the ElementId="XXX" setting of SidebarLink, and it turns out that the “a” tag in the generated http code does not have the "id" attribute. Looking at the code, it is found that SidebarLink actually encapsulates a Link, but the ElementId is not passed to the Link component