All GUIs should have a tool tip explaining why something is greyed out and what needs to be done to make it active (and it needs to be useful information, not just "it doesn't apply" or "you're not allowed to do that now" — it's obvious the application thinks that because it's greyed out). In this case, I did a search against our ldap server, found an attribute that needed removing and did so. Then I did another search. This time the font changed to italic, and when I go to delete an attribute, Delete is greyed out. There is no clue anywhere as to what's going on. I searched in help for the ldap browser, and found very little.