The Default attribute combo box sets the primary attribute on the control for data binding.

默认属性组合框为数据绑定设置控件的主要属性。

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For example, one browser might show a select1 control as a pop-up menu or combo box while another might use radio buttons and a third a scrolling list.

比如，一种浏览器可能把select1显示成弹出菜单或者组合框，另一种浏览器则使用单选按钮，第三种则显示为滚动列表。

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It explains how to initialize the session scope variable to display the data corresponding to the initial value of the Combo Box control at application startup.

本文阐述了如何初始化会话范围变量，使之显示出与应用程序启动时Combo Box控件的初始值相对应的数据。

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