Add your favorites apps in raspbian aplications panel

You can change your favourites apps in aplications panel editing the file /home/pi/.config/lxpanel/LXDE-pi/panels/panel 

Modify the zone with these line at the beginning:

Plugin {
   type=launchbar
There must be a content like this:
Plugin {
  type=launchbar
  Config {
    Button {
      id=/usr/share/applications/iceweasel.desktop
    }
    Button {
      id=/usr/share/raspi-ui-overrides/applications/pcmanfm.desktop
    }
    Button {
      id=/usr/share/raspi-ui-overrides/applications/lxterminal.desktop
    }
    Button {
      id=/usr/share/applications/kodi.desktop
    }
  }
} Here we define like our favorites apps iceweasel web browser, pcmanfm file explorer, lxterminal and kodi:

You need restart rasbian or at least X server:

sudo /etc/init.d/lightdm restart