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When Plugin Manager starts there is progress of modules reading in NetBeans status bar. It would be more visible if the user has it in Plugin Manager window. Progress should appear in Plugin Manager similarly in case when the user pushes its "Refresh list" button.
The requested behavior description was added to the specification, see http://xdesign-tools.czech.sun.com:8080/JSPWiki/Wiki.jsp?page=JH_AutoUpdate_UI_Spec#progress_popup where is a description of the general concept - popup window containing a progress bar. Particular window titles/progressbar titles are parts of descriptions of particular buttons, which are again parts of descriptions of particular dialogs ('Updates' tab, 'New Plugins' tab etc.). Marking this issue as 'FIXED'.