Esri.ArcGISRuntime.Toolkit.Controls.LegendTree.PropagateTemplate C# (CSharp) Method

        private void PropagateTemplate()
        {
            // set the template on all descendants including the legend items
            LayerItems.Descendants(item => item.LayerItems).ForEach(item =>
            {
                item.Template = item.GetTemplate();
                item.LegendItems.ForEach(legendItem => legendItem.Template = legendItem.GetTemplate());
            });
        }