fix typo in examples

examples/MenuMethodsExample.js

@@ -0,0 +1,41 @@
+import React, { Component } from 'react';
+import { Text, TouchableOpacity } from 'react-native';
+import Menu, {
+  MenuContext,
+  MenuOptions,
+  MenuOption,
+  MenuTrigger
+} from 'react-native-popup-menu';
+
+export default class ControlledExample extends Component {
+
+  onOptionSelect(value) {
+    alert(`Selected number: ${value}`);
+    if (value === 1) {
+      this.refs.menu.close();
+    }
+    return false;
+  }
+
+  openMenu() {
+    this.refs.menu.open();
+  }
+
+  render() {
+    return (
+      <MenuContext style={{flexDirection: 'column', padding: 30}}>
+        <Menu onSelect={value => this.onOptionSelect(value)} ref='menu'>
+          <MenuTrigger text='Select option'/>
+          <MenuOptions>
+            <MenuOption value={1} text='One' />
+            <MenuOption value={2} text='Two (not closing)' />
+          </MenuOptions>
+        </Menu>
+        <TouchableOpacity style={{ paddingTop: 50 }} onPress={() => this.openMenu()}>
+          <Text>Open menu from outside</Text>
+        </TouchableOpacity>
+      </MenuContext>
+    );
+  }
+
+}