如果没有这个控件，CoolItem就没有功能，通常也没有可视的实现。
Without this control, the CoolItem has no function and typically no visual realization.
一个自定义的组合框控件类，实现了自画功能。
Since the definition of a combination box controls and realizes the function of sel …
NET的一项功能，它允许将控件数据与其表示形式相分离。
NET feature that allows the separation of control data from its presentation.
可以在运行时添加控件，但只能在加载功能区之前添加。
You can add controls at run time, but only before the Ribbon is loaded.
可以在运行时添加控件，但只能在加载功能区之前添加。
You can add controls at run time, but only before the Ribbon is loaded.
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