摘要：
TargetControlID - The ID of the Button Control to extend.(要进行扩展的按钮控件)ConfirmText - The confirmation text to display.HTML entities can be used,such as for a newline character.(要显示的确认文本，可以是HTML实体，如一个换行符)OnClientCancel - The Client script to execute when the Cancel button is clicked in the con 阅读全文
