No, it doesn’t mean that it must be in this DIV – the DIV id is just a way to get a reference to the parent container in the HTML so the entire Silverlight control can be dynamically resized as the content within it grows. There may be other ways you can achieve the same result without naming the DIV…

When the control ItemControl is created, One has no idea what will be the name of the tab. Does this mean that the ItemControl user control has the requirement that “if you want to use me, you have to put me inside a div with a name of CommentsSection?”