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Код

public void SetToolTipTemplate(Object obj, string templateName)
        {
            if (obj is FrameworkElement)
            {
                FrameworkElement fe = (FrameworkElement)obj;
                ToolTip tt = new ToolTip();
                if (fe.ToolTip != null)
                {
                    if (obj is System.Windows.Controls.Control)
                    {
                        tt.Content = fe.ToolTip;
                        tt.Template = this.FindResource(templateName) as ControlTemplate;//вот тут  'ToolTip' cannot have a logical or visual parent.
                        fe.ToolTip = null;
                        fe.ToolTip = tt;
                    }
                }

                // recurse through the children
                IEnumerable children = LogicalTreeHelper.GetChildren(fe);
                foreach (object child in children)
                {
                    SetToolTipTemplate(child, templateName);
                }
            }
        }

SetToolTipTemplate(this, "ToolTip1");