How to use an extensibility dll for designer support

Question

I've written a UITypeEditor and it works when the editor lives in the same assembly (or one of the referenced assemblies) as the types using it. Then I can use something like:

[Editor(typeof(MyUIEditor), typeof(UITypeEditor))]

However, I'd like to move this to a separate assembly, one that is not referenced by the assemblies with types that use it, because I don't want to have to distribute the code that is solely to for the VS designer. I know this can be done, but can't figure out how to setup the editor/where to put the extensibility assembly to get it to work. I've tried this:

[Editor("MyProject.Extensibility.MyUIEditor, MyProject, Version=1.0.0.0, Culture=neutral, PublicKeyToken=e54367fa007b34d2", typeof(UITypeEditor))]

And copied the extensibility assembly into the bin\debug folder with the main project. No joy.

How is this done?

Answer 1

I asked a different question that was a bit more focused and got the answer. See this question related to referencing a UITypeEditor in another assembly. The trick is to set a registry key (or put in GAC).