Portalchildren's with set by a listener.
When the browser window is re sized the width property set was not retained, Instead it gets reverted to the initial value.

Here is the zkFiddle

http://zkfiddle.org/sample/29dbkgt/3-PortalChildren-Width-is-getting-reseted-to-initial-value

Steps to reproduce:

Run the fiddle

Click on re size button (Portletchildren width is set to new value by the listener)

Re size browser window (Protletchildren's width is reset to initial value without any action)