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Just right click any suite project. Suite doesn't support deleting at the moment but user shouldn't be bothered by IAE.
Created attachment 23092 [details] IAE
Would presumably affect any project type not supporting delete.
I will fix it tomorrow.
Fixed. Checking in ProjectTab.java; /cvs/projects/projectui/src/org/netbeans/modules/project/ui/ProjectTab.java,v <-- ProjectTab.java new revision: 1.26; previous revision: 1.25 done