• icon NativeImage - 显示在缩略图工具栏中的图标.
• click Function
• tooltip String (可选) - 按钮的提示文本.
• flags String - 控制按钮特定的状态和行为. 默认为 ['enabled'].

flags 属性是一个数组，包含以下String类型的值:

• enabled - 该按钮处于活动状态并可供用户使用.
• disabled - 该按钮被禁用。 它存在，但有一个显示状态表明它不会响应用户操作。
• dismissonclick - 当按钮被点击时，缩略图窗口立即关闭。
• nobackground - 不可以画按钮边框，只能使用图片背景。
• hidden - 该按钮对用户不可见。
• noninteractive - 该按钮已启用，但处于未激活状态; 没有绘制按钮按下状态。 这个值用于通知功能的按钮实例。

ThumbarButton Object

• icon NativeImage - The icon showing in thumbnail toolbar.
• click Function
• tooltip String (optional) - The text of the button's tooltip.
• flags String - Control specific states and behaviors of the button. By default, it is ['enabled'].

The flags is an array that can include following Strings:

• enabled - The button is active and available to the user.
• disabled - The button is disabled. It is present, but has a visual state indicating it will not respond to user action.
• dismissonclick - When the button is clicked, the thumbnail window closes immediately.
• nobackground - Do not draw a button border, use only the image.
• hidden - The button is not shown to the user.
• noninteractive - The button is enabled but not interactive; no pressed button state is drawn. This value is intended for instances where the button is used in a notification.