The blah functions are what happens when you click the buttons. The thing about that piece of code is that it is for BlitzPlus only since it uses GUI functions. Plus it will look like a Windows window, whereas for most games you want your own images for the buttons.
Basically you use the drawing commands like DrawImage to draw your buttons on the screen and then check MouseHit() every frame (with a statement like "if MouseHit(1) Then...) to see if the user has clicked the mouse. If so check MouseX() and MouseY() to see where the mouse is located; if it is located over a button react to the click.
Basically you use the drawing commands like DrawImage to draw your buttons on the screen and then check MouseHit() every frame (with a statement like "if MouseHit(1) Then...) to see if the user has clicked the mouse. If so check MouseX() and MouseY() to see where the mouse is located; if it is located over a button react to the click.