Visual Studio 2005 provides some capabilities for visually editing the styles for elements in an HTML or ASP.NET page. For example, in Design view, you can right-click a control or element, and then choose Style to display the Style Builder dialog box. Although the style builder enables you to create and edit in-line styles, there’s no way to edit the styles that are inherited from a linked style sheet. The new CSS Properties window provides this capability — it enables you to edit both in-line styles and styles in linked style sheets.
The CSS Properties window is an add-in package to Visual Studio 2005. It does not change the behavior of any feature in Visual Studio 2005; it simply adds additional functionality specific to editing CSS in Design view.