function OnClientResponseEnd() 
{ 
   var tooltip = Telerik.Web.UI.RadToolTip.getCurrent(); 
   if (!tooltip) return; 
   var popup = tooltip.get_popupElement(); 
   popup.style.width = ""; 
   popup.style.height = ""; 
}

this forces the manager to resize the tooltip again after the data is received through the AJAX call, needs to be after the tooltip is shown!



try some height (10-20px), no width, content scrolling set to auto. This will allow the table to resize as the browser does it