Steps to Reproduce

run messbox-uuid-script.zul

click the button in sequence: A, B, OK, C, A, B

Current Result

zk.wpd:24823 Uncaught TypeError: Cannot read property '0' of undefined
    at Object.onBind (zul.wnd.wpd:2946)
    at init.onBind (eval at $.evalJSON (zk.wpd:28129), <anonymous>:9:20)
    at init.fireX (zk.wpd:21714)
    at init.fire (zk.wpd:21834)
    at zk.wpd:21082
    at doAfterMount (zk.wpd:24636)
    at mtAU0 (zk.wpd:24629)
    at mtAU (zk.wpd:24625)
    at zkx (zk.wpd:24816)
    at zkx_ (zk.wpd:24832)

Expected Result

no error

Debug Info

when detaching the window a <script> element remains in the DOM with a UUID.
This UUID may be re-used at server side for new components created later - in this for a label-widget inside the messagebox (causing the error when opening the message box for the second time)

Root Cause

Workaround

Disable UUID recycle: in zk.xml

	<library-property>
		<name>org.zkoss.zk.ui.uuidRecycle.disabled</name>
		<value>true</value>
	</library-property>