I looked into this more, including creating a project, and it would seem that this is impossible to do when you use the “Static Public Member Functions” to launch an AlertWindow. It will not call your inherited constructor.
I don’t use the AlertWindow that way myself; I don’t use the static functions, I use the regular constructor and create one into a std::unique_ptr, and then you have a pointer to it and you can do whatever you like to set the text, arguments, look and feel, etc.
Sorry for misleading you…
The only way to apply a LookAndFeel to the static methods is to use the defaultLookAndFeel, apparently: