[GNC] How do I change keybindings for tab switching in GnuCash?

[Glenn Fowler]

Hi,

I am trying to change keybindings for tab switching in GnuCash which is
default CTRL + ALT + PAGE UP/DOWN.

It would be nice to change it to a function key or CTRL + TAB. In
gtk-3.0.css I tried:

@binding-set Switch-Page
{
  bind "F2" { "change-current-page" (1) };
  bind "F3" { "change-current-page" (-1) };
}

entry
{
-gtk-key-bindings: SwitchPage;
}

but it doesn't work. The syntax is correct as I can do other keybindings
for clipboard copy, clipboard paste, move the cursor, etc.

Anyone in the community know how to do this?

Thanks!