我们经常会使用到组合框，而组合框是是有2 种功能的--下拉和列表。一般情况

下，列表框的宽度和选择框是一样宽的，但是我们有些时候确实很需要把列表框

的宽度变大，一便让我们能更好的看我们要选的东西。-We often use the combo box, the combo box is there are two kinds of functions- and the drop-down list. In general, the width of the list box and select the box is as wide, but sometimes we really need to list box the width of the larger one will allow us to better see the things we want to choose.