Super!, it works for me too!
I am doing something like this
var tl = new TimelineLite();
tl.to( $chevronIcon, 0.1, { rotation:90 } )
.to( $childs, 0, { height: 0 }, "-=0.1" )
.to( $childs, 0.3, { height: 35, onComplete: function(){ $childs.find("td").show() } }, "-=0.1" )
.to( $childs, 0.3, { opacity:1 } );
By adding function(){ ... } on the "onComplete", solve my issue "Uncaught TypeError: this.vars[r].apply is not a function"
Thank you