will be fixed in next minor release.
as a quick fix you can change the set of ToolTipSize in HtmlToolTip.OnToolTipPopup method to:
as a quick fix you can change the set of ToolTipSize in HtmlToolTip.OnToolTipPopup method to:
//Set the size of the tooltip
e.ToolTipSize = new Size((int)Math.Ceiling(Math.Min(_htmlContainer.ActualSize.Width, MaximumSize.Width)),
(int)Math.Ceiling(Math.Min(_htmlContainer.ActualSize.Height, MaximumSize.Height)));