Hi @m_adam! Thank you for your response. I looked for a way to mark the post as a question while submitting, I didn't think to look at the submitted post again for that option. I'll remember next time. KillDocument and Exiting were never ment to run consecutively, they were just two things I wanted to try for different scenarios. I should have clarified that. StopAllThreads() unfortunately wasn't enough, but adding in a small message plugin to trigger the exit from the CoreMessage() did the trick. I'm now changing a global boolean for the CoreMessage() to look for. Is that what you had in mind? Thank you for your help, everything works now. I'll make sure and try and find the "mark as solved" button on my way out :) Edit: I can't actually mark your comment as the solution, only this one...

@s_bach said in Confusing ToolData content: The whole group is hidden using DESC_HIDE. Ah ... didn't even consider that one. This makes perfect sense. Thanks for going through all the trouble of explaining.