Type error when closing window

Suite and Optimus Suite 5
#1

Hello,

I try this online sample link [url]http://dhtmlx.com/docs/products/dhtmlxWindows/samples/01_init/01_minimal_init.html[/url]
using FF, when closing window, in firebug i got this message ‘TypeError: this.w[c.id] is undefined’

#2

Hello
Closing window destroys this window object. So it destroys its attachment. To avoid it you can show()/hide() windows to save its content