How to create Master Detail view with two user controls in MVVM?

I am little confused about how to create Master Detail view with two different user controls.

There are three choices,

Choice 1

CustomerMasterView + CustomerMasterViewModel
CustomerDetailView + CustomerDetailViewModel

And keep both View Models in App.Resources

But by doing this, binding becomes complex with all static resources source markup code.

Choice 2

CustomerViewModel
CustomerMasterView
CustomerDetailView

Both views share same ViewModel via App.Resources, well even with the binding code has too many items.

Choice 3

CustomerMasterView + CustomerMasterViewModel
CustomerDetailView + CustomerDetailViewModel

Both view's have DataContext set to their corresponding ViewModel. Now here is the l开发者_开发知识库ittle issue, CustomerMasterView has Selector (ListBox or DataGrid or whatever), whose SelectedItem needs to be bound to CustomerDetailViewModel's "Customer" Property as two way binding.

Does it look good?

<!-- CustomerMasterView -->

<ListBox
    ItemsSource="{Binding CustomerList}"
    SelectedItem="{Binding DataContext.Customer,ElementName=customerDetailView}"
    />

<local:CustomerDetailView
    x:Name="customerDetailView"
    />

But by doing this, I am defying purpose of ViewModel as it adds more dependency in my UI code.

Which one is most preferred way or is there any other way? Should I create nested View Models?

I am also trying to learn Prism, and I have little confusion of how to do this right, any help will be appriciated.

The simplest appraoch in my opinion would be to have a single view model, with two UserControls.

Your ViewModel would have your list of customers, as well as a "ActiveCustomer" or "SelectedCustomer". Your MasterView (with the DataContext set to you ViewModel), would contain your list, wired up like this:

<ListBox ItemsSource="{Binding Customers}" SelectedItem="{Binding ActiveItem, Mode=TwoWay}" />

Your MasterView will also include your DetailsView (another UserControl). It looks like this:

<views:DetailsUserControl DataContext="{Binding ActiveItem}" />

You might be interested in the BookLibrary sample application of the WPF Application Framework (WAF). It shows how to implement a Master/Detail scenario with two Views (separate UserControls) and two ViewModels.