8.4.4 Subclasses of <button>

The subclasses of <button> are as shown in Table 8.4. These subclasses include not only buttons that can appear in any sheet, but also their equivalent classes of menu item. Thus, an instance of <check-button> represents a button whose state can toggle a specific value on and off, and an instance of <check-menu-button> represents a menu item whose state can toggle a specific value on and off in the same way.

Since all the subclasses of <button> are themselves value gadgets, each one supports the value protocol, as described in Section 8.1 on page 503.

Table 8.4 Subclasses of the <button> class

<button>
	<check-button>
	<check-menu-button>
	<menu-button>
	<push-button>
	<push-menu-button>
	<radio-button>
	<radio-menu-button>

---

Functional Developer Library Reference: DUIM - 3 Dec 1998