Custom categories must handle common characteristics of a category, such as managing a list of contained children, label, icon name, and so forth.
自定义类别必须处理一个类别的共有特性，例如管理一组子类、标签、图标名称等。
When Alice raises her hand, the hand icon on Bob's window blinks and Bob can take the necessary steps to handle it.
当alice举起手后，Bob的窗口上的Hand图标将闪烁，那么Bob就会采取必要的措施来处理它。
Each color component in the ramp has a circular color handle on the left side, and a square color icon on the right side. The active color has a white border around its color handle and icon.
渐变在每个颜色部分具有一个圆形的颜色柄在左边，和一个正方形颜色图标在右边。当前颜色具有一个白色边境围绕颜色柄和图标。
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