When the menu item or toggle button is selected, a filter, as shown in Listing 6, is added to Display to enable drag and drop of Editor and View tabs.
当用户选择这个菜单项或触发按钮时，就会有一个如 清单6 所示的过滤器被添加到Display 中，从而启用编辑器和视图标签的拖放操作。
Add a toggle button to the group.
将切换按钮加入至群组。
Gets or sets a value that indicates whether the toggle button is pressed or not pressed.
获取或设置一个值，该值指示是否按下了切换按钮。
Gets or sets a value that indicates whether the toggle button is pressed or not pressed.
获取或设置一个值，该值指示是否按下了切换按钮。
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