I would like to add some custom attributes and so that it can be displayed in the gridview of siteadmin.
I found that there is gridCfgs[name].storeReaderFields in siteadmin.js.
Is it related?
If not, how can I do that?
The post http://forums.adobe.com/message/5032804#5032804 might give some idea.
You need to overlay SiteAdmin.js & /libs/wcm/core/content/siteadmin/grid/assets/columns/ & implement the custamization.
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