How to center the Rectangular Grid to a coordinate beginning?

I am reading a Grasshopper tutorial Generative Algorithms (second edition, by Zubin Khabazi).

On page 51 of this book, author is describing the usage of Rectangular Grid component.

What I am confused with, is that it seems that from time when this book was published (2010) Rectangular Grid component has changed a bit.

What I a confused of is the point, which is the origin of this grid.

In the version of the component described in the book, origin of the grid is it's center. While as, in the newest Grasshopper 0.8.0066 origin of the grid is in it's bottom left corner.

Take a look:

How can I change this?

I would like to have a grid origin, as a center point of the grid.

Thank you.