指定组合框或列表框控件中数据值的源。

Specifies the source of the values in a ComboBox or ListBox control.

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指定最近添加到组合框或列表框控件中的数据项的索引值。

Specifies the index of the item most recently added to a ComboBox or ListBox control.

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您可能认为没有太大必要为文本字段和列表框之外的控件创建窗口小部件类。

You might think that there's not much reason to create widget classes for controls other than text fields and list boxes.

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