private void OnGroupExpandChanged(object sender, LayoutGroupEventArgs e)
        {
            var layoutControlGroup = ((XafLayoutControlGroup)e.Group);
            var modelNode          = layoutControlGroup.Model.GetNode(PredefinedMap.LayoutControlGroup);

            modelNode.SetValue <bool?>("Expanded", layoutControlGroup.Expanded);
        }
        private void OnGroupExpandChanged(object sender, LayoutGroupEventArgs layoutGroupEventArgs)
        {
            var layoutControlGroup = ((XafLayoutControlGroup)layoutGroupEventArgs.Group);

            ((IModelLayoutGroupLayoutControlGroup)layoutControlGroup.Model).GroupExpanded = layoutControlGroup.Expanded;
        }