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Populating a tree with a server call works fine only the first time

I use thid code on my jsp page.

On IE it works fine only the first time.
When I reload the page to load new data from server, the tree doesn't loads properly, and tree seems to load the same data stored on first time.

On Firefox I don't have any problem and tree works fine every time.

is it a caching problem? Is there a way to solve my problem?

This is the code: div

This is the code:

div dojoType="dojo.data.ItemFileReadStore" jsId="continentStore" url="/action.do?....
div dojoType="dijit.Tree" id="tree" store="continentStore"