VC++列表值动态添加与删除，以前见到过的小功能，点选按钮可在左侧的列表框中动态增加项值、删除项值，类似网页中的Select列表，在用法上有相似之处。-The list of VC++ value dynamically add and delete previously seen little feature, click the button in the left list box dynamically increase the key value, the value of the d