INavigation = Ext.extend(Ext.Window ,{ id:'iNavigation', xtype:"window", height:160, cls: 'my_win', ...
style: { z-index: '9999' }
MyWindow= Ext.extend(Ext.Window ,{ ... initComponent: function(){ var onTop = new Ext.WindowGroup; onTop.zseed = 10000; this.manager = onTop; }