Steps to Reproduce

Run fiddle
http://zkfiddle.org/sample/33u3iah/3-error-box-not-sticking-in-closed-group-box
Open the groupbox by clicking on it, and show validation messages by clicking the save button.
Scroll the groupbox

Current Result

Data-scrollable doesn't work (popups don't follow scroll pos
groupbox._doScroll is never invoked

Expected Result

groupbox._doScroll should be invoked and data-scrollable should trigger

Debug Info

ContainerWidget only registers the JS scroll listener on contentNode during bind
If the groupbox is rendered closed, the contentNode doesn't exist yet.

Root Cause

Workaround

Add a scroll listener during Open

<script><![CDATA[
zk.afterLoad('zul.wgt', function() {
var xGroupbox = {};
zk.override(zul.wgt.Groupbox.prototype, xGroupbox ,{
setOpen : function() {
var self = this;
var result = xGroupbox.setOpen.apply(this, arguments);
this.domListen_(this.getCaveNode(), 'onScroll');
setTimeout(function()

,700);
return result;
}
});//zk.override
});//zk.afterLoad
]]></script>