We also use the -raisecmd callback on the second tab to switch the third tab from its disabled to its active state once the second tab has been raised for the first time.
我们还在第 二个标签上使用了 -raisecmd 回调，目的是当第二个标签第一次 被重新激活时将第三个标签的状态由禁用切换为活动。
This is the event that is raised when the user switches from one TAB to the next.
这就是当使用者切换索引标签间时所引发的事件。
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