Reply to Different colours for the "side-buttons" (Midifighter 3D)?

hey guys,

I just started to map my Midifighter 3D... but recently i came across this problem:
I don't know how to set different colours by holing the side button in one bank..
to make this more clear:

Bank one... 16 different colours...
now what I want to do...

I want to have a different layout on Bank 1 as I press one side key, let's say button 3...

is this possible to map? If it is, how?

looking foreward to your answers

sincerly Mephisto