it is wxwidgets.. I know it.. don't lie.. I recognize wxAUI and wxPropertyGridManager if i see them
Is that a 3D-Gamestudio Game Editor? If so, i need to contact you because this would make one of my dream projects possible. I will send out a complete "job application" to you in the next days with a complete use-case if this is a 3D-Gamestudio edtior

Sorry - I Can not download the Editor atm as my internet connection is too slow (the next 2 days)