Kimpanel in KDE Plasma Addons
Kimpanel has been introduced in KDE Plasma Addons for a long time, but due to some personal reason, the origin author can't maintain it anymore and leave some bug not fixed. Since KDE 4.8 User:Weng Xuetian takes over the maintenance and rewrite it into data engine and widget, all known old bug is fixed.
Install it, and place it on the panel. If you are using Fcitx 4.2 or later, then there you go.