Try to hook with this:
PHP Code:
register_clcmd("hegren","hook_he")
register_clcmd("flash","hook_flash")
register_clcmd("sgren","hook_smoke")
Works only for VGUI menu.
I want make plugin which allows you to buy more than one grenade for old style menu too.
Try to use cl_buy.inc but he not work when I have more than one HE grenade, showing "You cannot carry anymore!".