Transparency Pixel colour for Sprites on HP Prime

[matalog]

From the chat in this link:

https://www.omnimaga.org/hp-calculator-p...hp-prime)/

It seemed like the 'sprites' can be created and used with transparency colour/pixels, is that not the case?

Most even in-any-way modern programming languages allow some parts of graphics objects to be transparent, are you saying that what you did was to mask them off and there may be another method? Or is there no way to have parts of a GROB transparent apart from using a mask to hide them?