[Pharo-project] Issue 1692: MNU when tried to navigate pop up menus with the keyboard

Pharo image: Pharo-core Pharo core version: PharoCore1.1ALPHA Latest update: #11116 Virtual machine used: Squeak 4.2.2beta1U | Cocoa Squeak 5.0.0b9 64*32 Steps to reproduce: 1. Open a pop up using your mouse o pressing <esc> 2. Try to select an action using your keyboard. Enter text to narrow down your matching items or using the arrow keys, neither work anymore. Francisco