I would like to be able to style, for example, all grids on my page with certain rules. Thus, if each component had a unique class in its top-level rendering I could use it to cascade through it.

This also applies to dropdown/popup elements (for example, be able to target the popups of dropdownlists).

Ideally, elements that have additional popups (like the dropdownlists) will also expose parameters like DropDownClass so I can add my own class to them and style them per instance, so I don't affect all other instances in my app.