Steps to Reproduce

Run this code and follow the steps.

<zk>
	<button label="1. Open Popup (contains a chosenbox)" popup="pop"/>
	<popup id="pop">
		<chosenbox width="200px" />
	</popup>
	<div>2. Open chosenbox dropdown (leave it open) and click outside the popup. </div>
	<div>3. Then reopen the popup. </div>
</zk>

Actual Result

When reopening the popup the <chosenbox> is invisible.

Expected Result

The <chosenbox> should remain visible.

Debug Info

This works properly with other combowidgets e.g. <combobox>

Root Cause

The <chosenbox> gets popup related inline styles which don't get cleaned up when closing the outer popup:

z-index: 1801; visibility: hidden;

Workaround

a css based workaround is to add the following style rule (avoiding the invisibility):

.z-chosenbox {
	z-index: inherit!important;
	visibility: inherit!important;
}