隐藏字符也计算在内，即使它们不显示。
Hidden characters are counted even if they are not displayed.
如果级别成员是其父级的唯一子级，并且名称为空或空字符串，则隐藏该级别成员。
A level member is hidden when its name is identical to that of its parent.
一个支持编辑隐藏文本字符串的控件。
A concrete control that supports editing a hidden text string.
一个支持编辑隐藏文本字符串的控件。
A concrete control that supports editing a hidden text string.
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