[ADF-2824] Reviewed docs for new components in 2.4 (#3400)

docs/core/menu-button.model.md

@@ -0,0 +1,42 @@
+---
+Added: v2.4.0
+Status: Active
+Last reviewed: 2018-05-25
+---
+
+# Menu button model
+
+Defines the properties for an item in a [Buttons Menu component](../core/buttons-menu.component.md).
+
+## Basic usage
+
+```ts
+let button = new MenuButton({
+    label: 'Export',
+    icon: 'file_download',
+    handler: this.exportItem.bind(this),
+    id: 'export-button',
+    isVisible: this.isItemValid.bind(this)
+});
+```
+
+## Properties
+
+| Name | Type | Description |
+| ---- | ---- | ----------- |
+| label | `string` | Label to display for the button. |
+| icon | `string` | Icon to display for the button. |
+| handler | `function` | Callback for the event handler for button clicks. |
+| styles | `string` | CSS classes to apply to the button. |
+| id | `string` | Id of the button. |
+| isVisible | `function` | Boolean function that determines whether the button is visible (returns true) or hidden (returns false). |
+
+## Details
+
+An array of [`MenuButton`](../../lib/core/buttons-menu/menu-button.model.ts) instances is passed to the Button Menu component via its
+`buttons` property. See the Buttons Menu component page for a code sample and
+further details about setting up the menu.
+
+## See also
+
+-   [Buttons menu component](../core/buttons-menu.component.md)