// DECLARATION IN LISTBOX HEADER
	template<typename Func>
	void register_sorting_option(const int col, const Func& f)
	{
		set_column_order(col, {
			[f](int lhs, int rhs) { return f(lhs) < f(lhs); },
			[f](int lhs, int rhs) { return f(lhs) > f(lhs); }
		});
	};


// USAGE

	hotkey_list.register_sorting_option(0, [this](const int i) { return visible_hotkeys_[i]->description.str(); });
	hotkey_list.register_sorting_option(1, [this](const int i) { return hotkey::get_names(visible_hotkeys_[i]->command); });
	hotkey_list.register_sorting_option(2, [this](const int i) { return !visible_hotkeys_[i]->scope[hotkey::SCOPE_GAME]; });
	hotkey_list.register_sorting_option(3, [this](const int i) { return !visible_hotkeys_[i]->scope[hotkey::SCOPE_EDITOR]; });
	hotkey_list.register_sorting_option(4, [this](const int i) { return !visible_hotkeys_[i]->scope[hotkey::SCOPE_MAIN_MENU]; });