Assign ListBox Item Template dynamically

<UserControl.Resources>

<DataTemplate x:Name="ArticleEntryTemplate">

<myCustomControl:ArticleEntry />

</DataTemplate>

<DataTemplate x:Name="ArticleEntryTemplate">

<myCustomControl:ArticleEntry_Mini />

</DataTemplate>

</UserControl.Resources>

<ListBox x:Name="lstArticles" ItemsSource="{Binding}" />

// Set Data Template

if (GlobalVars.appMode == AppMode.Mini)

lstArticles.ItemTemplate = ArticleEntryMiniTemplate;

else if (GlobalVars.appMode == AppMode.Regular)

lstArticles.ItemTemplate = ArticleEntryTemplate;