AspUserда, только в studio 2010 можно было дальше открыть вот так
в studio 2013 не могу найти такого конструктора

как жаль, что гугло в вашем доме отключили. это невыносимо печально...

The Style Builder dialog (aka New Style wizard) is deprecated. It still exists in the WebForms editor (under Format -> New Style, but only after you've loaded design view), but not in the new HTML and CSS editors.

The reason for this is because the dialog depends on the (also deprecated) HTML Designer, and because it is very out of date. Instead, you should consider writing your styles in the CSS editor, which has some better features (such as supporting CSS3, vendor prefixes, snippets, color picker, and several other editing improvements).

только без просьб "а по-русски?", окэ?