Plugin based application - best way to open plugin's own window

I'm developing a plugin based application.

I wonder what's the best way to open the plugin's config / main window.

Currently my application show a window with the compatible plugins and two button with "config" and "open" that should open the plugin's own main / config window.

One approach might be to expose by the plugin interface the custom usercontrol, so the "open" button can take the plugin's usercontrol and open the window.

However exposing the whole user control doesn't sound much good to me, so I wonder if there is another way to achieve this.