title: Set popup-window-size corresponding to window-size
body: <p>I have an gwt-ext window (used as a popup), this popup is launched from a GWT application. I´m searching for a solution to set the window-size of the popup to a size, that it nearly fills the screen, not maximize, but to fill the area of an underlying part of the GWT application that launched this popup. Does anybody know a solution for that problem?</p>