VB对ComboBox的输入内容进行检查，在失去光标焦点时判断输入内容是否符合要求，不正确则给出提示。窗口中使用了临时标签，用来获得焦点，使组合框能够失去焦点，并在失去焦点时进行有效性检查。输入的数据不在列表中，请重新输入-VB ComboBox contents of the input is checked, the cursor loses focus when typing to determine whether the request is not correct, give tips. Window using a temporary tag to get the focus, so the combo box to lose focus, and validity check when they lose focus. Not on the list in the input data, please re-enter