can not release mymory when onTabClose

Hi.
I have been using a 2.6 pro version
My application can have many tabs.
and each tab is constructed by dhxTabbar.setContentHref(id,url);
I know that many tabs consume large amounts of memory.
But, when i close tab, browser won’t release memory.
In severe cases, all tabs has been closed, Nevertheless iexplore.exe memory usage is 1GB
Any Idea or solution exists?

Following is my code.

var dhxTabbar = dhxLayout.cells("c").attachTabbar();
dhxTabbar.setImagePath("/dhtmlx26/codebase/imgs/");
dhxTabbar.setHrefMode("iframes-on-demand");
dhxTabbar.enableTabCloseButton("true");
dhxTabbar.attachEvent("onTabClose",function(id) {
	dhxTabbar.normalize() ; 
	return true ;
});

Hi,

the tabbar doesn’t control the content of a page in an iframe. However, if you are using dhtmlx components in pages that are loaded in tabbar, the desctructor() method will be called automatically for them on unload. So, they can not cause the issue.