Clutter Background-Blur

Hey community,

I want to apply the Clutter.BlurEffect() only to the *background* of an 
element. If I try this, for example, with a semi-transparent panel:

let fx;
fx = new imports.gi.Clutter.BlurEffect();
imports.ui.main.panel.actor.add_effect(fx);

then I get a completely blurred panel, text and symbols included, but 
the background of the panel (usually the desktop background) gets not 
blurred. How can i blur only that what's 'behind' the panel?

~erdlof

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