Add "Pending ..." node while ajax content is loaded into tree
Imported From: http://groups.google.com/group/in-portal-dev/browse_thread/thread/6a9036ad05c2de72#
I propose we add "Pending ..." node (in places of loading content) while ajax tree node content is being loaded. This will create effect, that content loads faster. After content is loaded "Pending ..." node will be replaced with actual content.
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