private static final long serialVersionUID = 1L;
public void buttonClick(ClickEvent event) {
ImportUploadReceiver receiver = new ImportUploadReceiver();
ImportPopupWindow importPopupWindow = new ImportPopupWindow(
ExplorerApp.get().getI18nManager().getMessage(Messages.MODEL_IMPORT),
ExplorerApp.get().getI18nManager().getMessage(Messages.MODEL_IMPORT_DESCRIPTION), receiver);
importPopupWindow.addFinishedListener(receiver);
ExplorerApp.get().getViewManager().showPopupWindow(importPopupWindow);
}