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    <p>The way I do this is using the mediator pattern also. When the ViewModel wants to show a dialog, it sends a message which is picked up by the application's main window. The message contains an instance of the ViewModel used by the dialog.</p> <p>The main window then constructs an instance of the dialog window, passes the view model to it and shows the dialog. The result of the dialog is passed back to the caller in the original message.</p> <p>It looks something like this:</p> <p>In your view model:</p> <pre class="lang-cs prettyprint-override"><code>DialogViewModel viewModel = new DialogViewModel(...); ShowDialogMessage message = new ShowDialogMessage(viewModel); _messenger.Broadcast(message); if (message.Result == true) { ... } </code></pre> <p>In the main window codebehind:</p> <pre class="lang-cs prettyprint-override"><code>void RecieveShowDialogMessage(ShowDialogMessage message) { DialogWindow w = new DialogWindow(); w.DataContext = message.ViewModel; message.Result = w.ShowDialog(); } </code></pre> <p>I hope this is enough to give you the idea...</p>
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    1. COThanks for the answer. Could you clarify the below scenario please. Say you display a view model in the DialogWindow with Save and Cancel commands. When the user clicks Save on the view (bound to the SaveCommand) you would want to maybe run some validation and save the configuration, only if this is successful would the dialog close. I can't seem to get my head around how the VM would set the DialogResult of the view (therefore closing the dialog). Thanks again.
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    2. COThere are many ways of getting the VM to interact with the view without breaking the abstraction. For instance, the dialog view model base class typically has some base properties and methods to make showing dialogs a little easier (I typically have a interface for a dialog viewmodel that includes things like a method that is meant to run on view load, as well as the dialog result, commit/abort commands, etc). An easy way to get the viewmodel to tell the view to close is to expose a property (CanClose for instance).
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    3. COThen create a corresponding dependency property on your dialog, and when the datacontext changes set a binding between the two - that way you can handle any logic in your bound property's changed event handler. Then again, it's even easier to simply expose a "close" event on your dialog viewmodel, and in the dialog window data context changed handler subscribe to this event, the handler can assign appropriate dialog result and close the window.
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