MVVM View-First Approach How Change View

Does anybody have an idea how to change screens (views) in a MVVM View-First-Approach (The view instantiates the ViewModel:

DataContext="{Binding Source={StaticResource VMLocator},
Path=Find[EntranceViewModel]}"

)

For example: In my MainWindow (Shell) I show a entrance view with a Button "GoToBeach".

<Window>
  <DockPanel>
    <TextBox DockPanel.Dock="Top" Text="{Binding Title}" />
    <view.EntranceView DockPanel.Dock="Top" />    
  </DockPanel>
</Window>

When the button is clicked I want to get rid of the "EntranceView" and show the "BeachView". I am really curious if somebody knows a way to keep the View-First Approach and change the screen (view) to the "BeachView". I know there are several ways to implement it in a ViewModel-First Approach, but that i开发者_如何学JAVAs not the question. Perhabs I missed something in my mvvm investigation and can't see the wood for the trees... otherwise i am hoping for a inspiring discussion.

One possibility would be to have all views in the (MainWindow(Shell) and using Triggers for their visibility. But having a lot of different screens (views) all declared in the MainWindow doesnt feel right for me...

This question came up while reading this nice way of using MEF with MVVM I found on John Papas Blog: Simple ViewModel Locator for MVVM: The Patients Have Left the Asylum . But as nice as this marriage of view and viewmodel is, it seems like there is no way to change screens that satisfies me. :)

So in my opinion if you have a lot of screens(views) you better use a ViewModel-First-Approach...

This looks like it might help: Creating a ViewModel : do it before or after model data is available?

Failing that, how about creating the ViewModel once only at startup, and assigning it to each View window as it's created (rather than creating a new ViewModel each time). Then just close the first View and open up a new View as required, reassigning the single ViewModel instance.

You may want to look at Prism (i.e. the composite application library). Prism facilitates navigation between views via the region manager. This might be overkill for your application and can take a while to get your head around. Prism also allows you to develop using the MVVM pattern as well.

You can find more information about prism and prism navigation in the Prism documentation.