相反，您可以检查每个拥有用户权限的产品，以及在索引视图中隐藏或显示这个按钮，但是这个解决方案可能无法令您满意。

Instead, you could check each product for the user's rights and show or hide the buttons in the index view, but this solution may not perform to your satisfaction.

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还需要一个按钮显示和隐藏领先排名，如清单13所示。

You'll create a button for showing or hiding the leaderboard, as shown in Listing 13.

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您还可以收起侧边栏，为显示邮件提供更大的空间。此外，也可以使用sidebar操作栏按钮或面板分配器显示或隐藏侧边栏(见图4)。

You can also collapse the sidebar to maximize the available space for displaying mail, and you can use the sidebar action bar button or the panel divider to display or hide the sidebar (see figure 4).

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