It's very possible you've come across the problem of needing to scroll items in a side menu during a game (This can be very troublesome when making a cookie cli...
Nice tutorial. I don't know if it was possible back in 2014, but today I would work with layers and blenders to make the boxes disappear at the top and bottom of the screen. Just create a layer only for this, set it to "Force own texture", then create a fitting "blend out sprite" of any color and set it to blend mode "Destination out". It is important to spawn the blend-out-spites after the boxes are spawned - both in said layer. I did place the blend-out-boxes at the top and bottom of my scrollbars.
It's possible to make a tutorial for this?
Sure, but I'm lacking the time at the moment. Check out how the "destination out"-blender works in this video and I'm sure you will figure it out:
youtu.be/4ksZPuVP7lk
Thank you! :)