Blend December CTP was released a short time ago. Included in this new version is one change that I’d been requesting from Microsoft, and I am really happy they made it: You can now select every properties of a given element when you edit them in a style. In the previous version, some properties were hidden, for some reason, and you could only set them using the XAML editor. At least Width and Height were not visible in the properties pane, and maybe more. In the December CTP, this small defect is corrected, and you can set all the properties in the Style without having to write XAML. Good move!! Great tool!!
Dec 22 2007
Blend September CTP: Style without Width and Height
Blend December CTP: Style WITH Width and Height!!