SharePoint 2007 系列(6) -恢复显示被关闭的Web Part Gallery
Restore a closed web part
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To restore a closed Web Part to the page, click Site Actions, and then click Edit Page.
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In any zone, click Add a Web Part. In the Add Web Parts to [zone] dialog box, click Advanced Web Part gallery and options. The Web Part you closed appears in the Closed Web Parts collection.