[Stea]

Thanks, that did the trick. I added a search for the category I put my addon in, and I guess that's close enough:

if (not KeyBindingFrame) then
   KeyBindingFrame_LoadUI()
end
if not InCombatLockdown() then
  KeyBindingFrame:Show()
  for _,v in pairs(KeyBindingFrame.categoryList.buttons) do
    if v:GetText() == "AddOns" or v:GetText() == "ADDONS" then
      v:Click()
    end
  end
end