如何从JavaFX的ComboBox中获取所选项目？

我有ComboBox cbx 和一个TabPane包含选项卡（选项卡： t ）和一个按钮 b1 。因此，单击此按钮 b1 时，它将在TabPane中添加一个新标签 t ，并在其中添加一个新项目。 ComboBox cbx 包含选项卡的相同名称。问题是我不知道如何从 cbx 获取项目，并且该项目的名称与标签的名称相同，然后又是做点事，这样我就可以用javafx做到这一点，非常感谢：）

i have ComboBox cbx and a TabPane Contains Tabs (tab: t) and a button b1. So on click on this button b1, it adds a new tab t in the TabPane and it adds a new item in the ComboBox cbx contains the same name of the tab. The problem is i don't know how to get the item from cbx and much the name of the item with the same name of the tab and then Do something so how i can do this with javafx and thanks very much :)