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select Generate Threated Listeners property and look at Description area. The HTML tags shouldn't be visible
This is a problem in properties windows directly. The on-place help takes the tooltip text from the property. There are html tags used in the tooltip of the property because of improving visibility of important informantion that the property is deprecated. Loosing that visibility is bigger problem than to have html tags shown in on-place help. Therefore resolving this issue as WONTFIX.