Steps to Reproduce

http://zkfiddle.org/sample/1a1uvrs/2-popup-in-collapsed-borderlayout-region

Click "hide" button to hide the popup

Click the collapse arrow on the right corner of the borderregion to collapse the south borderregion.

Click the "show" button to set popup visible to true

Click the arrow on the bottom right corner to expand the region (NOT the region name to unfold it without pining it opened)

Current Result

popup has the dom style = display: none + visibility: visible which makes it non-visible

Expected Result

Popup should be visible after the borderregion is expanded

Debug Information

borderregion onShow event doesn't propagate to the overlapped window

Workaround

<window id="wnd" border="normal" title="Dialog" mode="overlapped">
 <attribute w:name="setVisible"><![CDATA[ 
 function(visible) {
 this.$setVisible(visible);
 var n = this.$n();
 if (visible && n.style.display == 'none') {
 this.setDomVisible_(n, false, {visibility: 1});
 this.setDomVisible_(n, true, {display: 1});
 }
 }
 ]]></attribute>