一个在主对话框中嵌入多个子对话框并可以实现在不同子对话框之间进行切换的例子，实现对话框局部内容的切换,进行对话框的局部刷新-One of the main dialog box to embed multiple sub-dialog and can be achieved in different sub-dialog box to switch between the examples, to achieve local content of the dialog box switch to