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How to open sub window from another subwindow in Vaadin?

Possible Duplicate:
How to open new subwindow from another subwindow in vaadin?

Hi,

I want to open one subwindow from another subwindow.That is, i m having one popup subwindow in that window i placed one button.If we click that button another popup subwindow should open. When i am trying this i m getting error that "java.lang.IllegalArgumentException: You can only add windows inside application-level windows." Can anyone tell me how to solve this in vaadin.

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