Drop down menus!?
I wrote a menu library a while back (2012 I think) and that is what I'm using for the menus. The buttons are handled by my button library. I created the button library in such a way that I could create button control arrays which makes building the button grid a snap. The libraries and documentation are included in the ZIP file it you want to have a look at them.
Had I not had to leave QB64 a few years back I was planning on incorporating them into something like Fellippe's InForm.
When testing libraries out I like to clone something familiar to see how well a library can handle it. That's why I'm cloning the Windows 7 calculator with InForm.