I am just learning ext - using ext3 - and I copied over the sample [2.0 migraion guide, http://extjs.com/learn/Ext_1_to_2_Migration_Guide] to use a window with layout [in the mentioned article, it's at: Upgrading LayoutDialog to Window/ext2 code]. From my API point of view, there is no difference to ext3 regarding this simple sample, but clicking the close button in IE [6.x], causes a script error, which I'll get rid off. The error do not appear with FF.
Sorry, no one answered that for me and the problem - with the given sample - just exists.
This was on my early lerning phase and I used other way, but I do not remember [soory, it's about a year ...].