Add grow bottom/top options

[gruo]

I am creating a series of slides with beamer to teach some git basics, where I would like to add some nice git graphs using this package. I intend to display a git graph on the right side (25% of text width) of (nearly) every slide which evolves during the presentation.

Currently the options to make the graph grow from bottom or top is missing. Is there a possibility to make it grow like intended (top to bottom or bottom to top)?