I am not sure if the WPF controls that make up Expression Blend's UI is packaged in the application in a usable way, like separate assemblies, etc. But if they aren't, is there a way to "extract" these controls so you can have the same controls in your app with the same look and functionality?
You can look in your install folder for blend under Program Files or Program Files (x86) and there will be style directories with the appropriate resources, I believe.
Otherwise you can use Snoop to look at WPF application structure and get what you need http://snoopwpf.codeplex.com/
Or a tool like DumpControlTemplate to pull it out of Blend, I know a few people that have done this.
Make sure that when you find a way that it is legal.
来源：https://stackoverflow.com/questions/5356024/is-there-a-way-to-extract-wpf-controls-of-expression-blend