以下是我试图自动化的场景：
1) Some text is already present in Textbox.
2) Click on Radio button.
3) Processing popup is displayed for few seconds. After popup disappears the textbox
becomes blank
4) After textbox is blank then I have to enter different value in text box.
请帮助我，如何等到文本框值为空。
我正在使用 IE 驱动程序进行自动化。
提前致谢