Perform Load On Demand Item Population In .Net Maui Treeview

<ContentPage.BindingContext>
    <local:ViewModel x:Name="viewModel"/>
</ContentPage.BindingContext>
<ContentPage.Content>
    <sfTreeView:SfTreeView x:Name="treeView"
                           LoadOnDemandCommand="{Binding TreeViewOnDemandCommand}"
                           ItemsSource="{Binding Menu}"
                           ExpandActionTarget="Node"
                           FullRowSelect="True">

    </sfTreeView:SfTreeView>
</ContentPage.Content>

internal class ViewModel
{

    public ICommand? TreeViewOnDemandCommand
    {
        get; set;
    }

    public ViewModel()
    {
        TreeViewOnDemandCommand = new Command(ExecuteOnDemandLoading, CanExecuteOnDemandLoading);
    }

    private bool CanExecuteOnDemandLoading(object sender)
    {
        var hasChildNodes = ((sender as TreeViewNode)!.Content as Model)!.HasChildNodes;
        if (hasChildNodes)
            return true;
        else
            return false;
    }

    private void ExecuteOnDemandLoading(object obj)
    {
        var node = obj as TreeViewNode;
        // Skip the repeated population of child items when every time the node expands.
        if (node!.ChildNodes!.Count > 0)
        {
            node.IsExpanded = true;
            return;
        }

        node.ShowExpanderAnimation = true;
        //Animation starts for expander to show progressing of load on demand
        Model? Info = node!.Content as Model;
        Microsoft.Maui.Controls.Application.Current!.Dispatcher.Dispatch(async () =>
        {
            await Task.Delay(1000);
            //Fetching child items to add
            var items = GetSubMenu(Info!.ID);
            // Populating child items for the node in on-demand
            node.PopulateChildNodes(items);
            if (items.Any())
                //Expand the node after child items are added.
                node.IsExpanded = true;
            node.ShowExpanderAnimation = false;
        });
    }
}