Define styles in other documents

My question is the following:

I would like to define styles for my applications, but I would
like to define it in a external document to use it in any appicattions.

I don't see the opction in Interactive designer. Somebody can help
me ?

Thanks

I know what you can do in Visual Studio for this...

Build a new project with create a ResourceDictionary that contains your
styles...

Build the library...

Then in you other projects, merge the library's dictionary into your
windows, forms or other controls dictionary...

You can then use your custom styles...