Python Expert

Create custom toolbar and show on startup
for 3dsmax

I mentioned my problem here as well:
https://forums.autodesk.com/t5/3ds-max-
programming/create-own-toolbar-with-programming/td-
p/10881096
in short, I want to create my own toolbar automatically.
for example, you can check D5 converter here:
https://www.d5render.com/download
when I download and install D5 converter and when I open Max
after installation, D5's toolbar appear in my max window
automatically. This is what we want for my scripts.
And Vray also does the same thing. when I install VRay, VRay's
toolbar appear my window (you can check picture)