No tooltip should be shown if there is no data for the tooltip: - RadToolTipManager: AutoTooltipify=true; IgnoreAltAttribute=true; no title attribute set for the elements on the page: no tooltips should be generated, but empty ones are - RadToolTip: IgnoreAltAttribute=true; no Text or content are set; no title attribute set on the target: no tooltip should be shown, but an empty one is Leave your comments below on the behavior you would expect from this property. Possible workarounds are attached to the thread.