what the Better way to do master detail with MVVM ?

[Gilmar]

Hello,

I have a question what would be the best way to do a master detail with silverlight. Already inquired with the ViewSourceCollection but still have some doubts about him that I will relate below:

1 - To filter, it does have a bank or only works with data in memory?
2 - It is very fast for records?

In my ViewModels, I have a property called SelectedItem, when I thought about calling this a ViewModel ViewModel daughter and so load the data from ItemSelecionado Father as in the example below.

public class ProductViewModel : ViewModelBase<Product>
    {
        public ComponentProductViewModel _vmComponentProduct;
 
        public ProductViewModel()
        {
            this._vmComponentProduct = new ComponentProductViewModel();
        }
 
        public ComponentProductViewModel VmComponentViewModel
        {
            get { return this._vmComponentProduct; }
        }
 
 
        public override Product SelectedItem
        {
            get
            {
                return base.SelectedItem;
            }
            set
            {
                base.SelectedItem = value;
                this._vmComponentProduct.GetDataAsync(string.Empty);                                                                  
            }
        }
    }

What is the best option? Do it as ViewCollectionSource or use like example ?

thanks

Vinisanp