Fix missing radiotray icon in KDE taskbar

Just installed radiotray in my brand new Kubuntu 14.10, and discover that its icon is missing from the taskbar. By chance I found the solution here. All you have to do is to modify ~/.local/share/radiotray/config.xml as follows:

<!-- <option name="gui_engine" value="appindicator"/> old value -->
<option name="gui_engine" value="systray"/> <!-- Correct value -->