I have a main form in 1 dll and I have other subforms in anther dll. Is there any way for one of the sub forms to tell the main form that something happened, so that it can take action?

I tried using an object that had an event that is handled in the main form, and pass that object to the sub forms in the dll, but the object has to exist in both places, and doesn't seem to work anyway.

Any ideas? Is this clear?