Use MVVM Light View Model Locator with Child Window in Silverlight 4

Question

I want to use the View Model Locator in a Child Window. Problem is this don't work:

<controls:ChildWindow x:Class="Views.PopupViews.AddAlert"
       xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
       xmlns:controls="clr namespace:System.Windows.Controls;assembly=System.Windows.Controls"
       DataContext="{Binding AddAlert, Source={StaticResource Locator}}>

I get the error: Cannot find a Resource with the Name/Key Locator

Answer 1

Ok the reason why it don't works is my childWindow is created inside the ctor of an IApplicationService.

This popupService is declared in the App.xaml:

<Application.Resources>
    <ResourceDictionary>
        <vm:ViewModelLocator xmlns:vm="clr-namespace:Client.ViewModel" x:Key="Locator" />
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="Assets/Styles.xaml"/>
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Application.Resources>
<Application.ApplicationLifetimeObjects>
    <popup:myPopupService/>
</Application.ApplicationLifetimeObjects>

Apparently, the view was created before the app resources !