[Bug 77110] [Updated] deskbar applet does not use new theme background until relogin

[Net Venture]

I just noticed that the background color change does not take effect
immediately after a change of theme but does change if the applet is
reloaded or after logging out and logging in again.

PS: Updated Subject

-- 
deskbar applet does not use theme background for Glider theme
https://launchpad.net/bugs/77110