Fluxbox compiling problems after making a change

I'm trying to make the change here: http://fluxbox-wiki.org/index.php?title=Howto_Make_dblclick_titlebar_maximize

I am using the current git version of the fluxbox source.

I assume that those instructions are perhaps no longer valid for the current git version.

In the void FluxboxWindow::setupWindow() function I can see no references to CommandRef or frame.

I would like to know if it is possible that I could work out where they should go in that function, with only having a limited knowledge?

I am still trying to learn programming and don't know enough just yet to work out where they should go. I assume I can't just paste in the sug开发者_运维知识库gested lines anywhere in that function, but why not?

I can paste the source if needed, but I am unsure where to paste to.

Editing the source is no longer necessary. Read man fluxbox-keys.