How can I enable the border around the selected scope in code in Visual Studio?

How can I Enable in VS8-10 the border/line that surround the codeblock where the cursor is? I have looked hard after this I kinda have to give up now. I have googled everything like: border, line, hightlight schope, and surround. I know it's possible, I have used it before, but can't remember where to enable it. e.g.: ``` if { if(foo) { ________________________________________________________________ I var s; <cursor here> // border around this and the next line I I var t; // border around this line too I ________________________________________________________________ } } ```