DSL Editor PowerToy
This nifty DSL Tools add-on will help you add custom toolwindows to your DSL designer.
It's the first step on a nice plan to make it easy to add a richer property and relationship editing experience for parts of your model which aren't displayed on the diagram.
The final experience might look a bit like this screenshot from a custom-written editor window in part of Jezz's service factory.
Nice one Jezz.