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How to free memory once my dhtmlxwindow is closed.

Hi,
In my application i have included a html page in my dhtmlxwindow as below..

win.attachURL("News.html");

now when i open this dhtmlxwindow some memory gets used by my browser . I am monitoring the memory usage on the WINDOWS Task Manager. But when i close the dhtmlxwindow by calling
win.close();
the memory usage does not reduce. I open many dhtmlxwindows in my application and as i keep working the memory usage keeps increasing for my browser. Pls let me know how can i release or free memory when i close a dhtmlxwindow. For grids on my page i use mygrid.destructor();

Is there anything similar i can use...? pls help?