这个物件不一定拥有键盘焦点。
窗体即将接收键盘焦点。
键盘焦点的概念与使用中视窗的概念相关。
The concept of keyboard focus is related to that of an active window.
具有键盘焦点的对象并不一定是选定的对象。
The object with the keyboard focus is not necessarily the selected object.
所有可以接收键盘焦点的对象都必须支持该属性。
All objects that can receive the keyboard focus must support this property.
获取一个值，该值指示此元素是否具有键盘焦点。
Gets a value that indicates whether the mouse is captured to this element.
对于每个元素，只要它是导航停止位，就可以接收键盘焦点。
Each element receives keyboard focus, as long as it is a navigation stop.
步骤2：键盘导航和可视焦点。
然后将记录当前持有焦点的窗口的每个键盘事件。
Each keyboard event is then recorded for the currently in-focus window.
不应有键盘陷阱：焦点可以进入和退出当前的ui。
不应有键盘陷阱：焦点可以进入和退出当前的ui。
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