menu cannot be selectable in dropdown defaultly

components/dropdown/dropdown.tsx

@@ -48,8 +48,13 @@ export default class Dropdown extends React.Component<DropDownProps, any> {
     const dropdownTrigger = cloneElement(children as any, {
       className: classNames((children as any).props.className, `${prefixCls}-trigger`),
     });
+    // menu cannot be selectable in dropdown defaultly
+    const overlayProps = overlay && (overlay as any).props;
+    const selectable = (overlayProps && 'selectable' in overlayProps)
+      ? overlayProps.selectable : false;
     const fixedModeOverlay = cloneElement(overlay as any, {
       mode: 'vertical',
+      selectable,
     });
     return (
       <RcDropdown

components/dropdown/index.en-US.md

@@ -27,7 +27,7 @@ You can get the menu list by `antd.Menu`, and set a callback function `onSelect`
 
 > Warning: You must set a unique `key` for `Menu.Item`.
 
-> Remove the highlighted style after click menu item via `<Menu selectable={false}>`.
+> Menu of Dropdown is unselectable defaultly, you can make it selectable via `<Menu selectable>`.
 
 ### Dropdown.Button
 

components/dropdown/index.zh-CN.md

@@ -28,7 +28,7 @@ title: Dropdown
 
 > 注意： Menu.Item 必须设置唯一的 key 属性。
 
-> 如果希望去掉菜单选中的背景效果，可以指定 `<Menu selectable={false}>`.
+> Dropdown 下的 Menu 默认不可选中。如果需要菜单可选中，可以指定 `<Menu selectable>`.
 
 ### Dropdown.Button
 

components/menu/index.tsx

@@ -55,7 +55,6 @@ export default class Menu extends React.Component<MenuProps, any> {
     prefixCls: 'ant-menu',
     className: '',
     theme: 'light',  // or dark
-    selectable: true,
   };
   static childContextTypes = {
     inlineCollapsed: PropTypes.bool,