def show_osm_downloader(self):
        """Show the OSM buildings downloader dialog."""
        from safe.gui.tools.osm_downloader_dialog import OsmDownloaderDialog

        dialog = OsmDownloaderDialog(self.iface.mainWindow(), self.iface)
        # otherwise dialog is never deleted
        dialog.setAttribute(Qt.WA_DeleteOnClose, True)
        dialog.show()
Show the OSM buildings downloader dialog.