Install Classicmenu indicator
The ClassicMenu Indicator is a third-party appindicator that brings the classic Gnome menu back. To install:
sudo add-apt-repository ppa:diesch/testing sudo apt-get update sudo apt-get install classicmenu-indicator
Run ClassicMenu indicator from Dash. You should be able to access your applications from the system tray now.
An Alternative method: use quick launcher app like Gnome Do or Synapse
Quick Launcher apps like Gnome Do or Synapse allows you to open your application very quickly. You just have to press a hotkey (Ctrl + Space) to activate the search box and you can quickly search for the app you want.