BPS Button layout

I need to know how the Mosaic Designer software identifies button on the BPS

When setting up button station triggering in Mosaic Designer, it's important that you allocate the correct trigger to the button. 

The BPS buttons are laid out as follows. 

Button 1 is located in the top left.

Button positions then run downward with button 4 being located in located in bottom left.

Button 5 is located in the top right.

Button positions then run downward with button 8 being located in located in bottom right.