def wait_for_pop_up(self,windowID,timeout):
self.do_command("<STR_LIT>", [windowID,timeout,])<EOL>
Waits for a popup window to appear and load up.

'windowID' is the JavaScript window "name" of the window that will appear (not the text of the title bar)                 If unspecified, or specified as "null", this command will                 wait for the first non-top window to appear (don't rely                 on this if you are working with multiple popups                 simultaneously).
'timeout' is a timeout in milliseconds, after which the action will return with an error.                If this value is not specified, the default Selenium                timeout will be used. See the setTimeout() command.