Delay in chains

[eskimoblood]

Is there a way to delay a chained function?
Using this:

tween.start('opacity', 0.5, 1).chain(function(){
  stoerer.setStyle('display', '')
}.delay(1000));

works but at the first time it gives me this error :

this.$chain.shift().apply is not a function
callChain()()mootools...2-core.js (Linie 1109)
onComplete()()mootools...2-core.js (Linie 3043)
complete()()mootools...2-core.js (Linie 3028)
step()()mootools...2-core.js (Linie 2996)
returns()()mootools...2-core.js (Linie 573)
[Break on this error] return (this.$chain && this.
$chain.len....shift().apply(this, arguments) : false;