problem with 2 IFRAMES and F5

Hello for all!

I create GWT Aplication. On the first page I has 1 IFRAME
(com.google.gwt.user.client.ui.Frame) and a few buttons in front of
him. when I click on one button - IFRAME replaced by another class. in
this class, I open another IFRAME and then press F5 to reload page.
after this the first IFRAME contains site from second IFRAME. How can
I prevent this caching content?

Thanks in advance

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