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I have a resource dictionary: <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Class="wpfUI2.MainWindowEvents"> <DataTemplate x:Key="WorkspacesTemplate"> <TabControl x:Name="Tab1" IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding}" ItemTemplate="{StaticResource ClosableTabItemTemplate}" Margin="4"/> </DataTemplate> ... And I want to add an event handler to the TabControl. MainWindowEvents is a class defined in a file with no other classes: Namespace wpfUI2 Public Class MainWindowEvents End Class End Namespace When I go to add an event handler like <TabControl x:Name="Tab1" IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding}" ItemTemplate="{StaticResource ClosableTabItemTemplate}" Margin="4" SelectionChanged="" /> and try to click between the "" to create the event I get an error saying that the class specified by the x:Class attribute must be the first in the file. Well it is!. Strangely, when I create the handler manually: Namespace wpfUI2 Public Class MainWindowEvents Public Sub Tab1_SelectionChanged(sender As System.Object, e As System.Windows.Controls.SelectionChangedEventArgs) End Sub End Class End Namespace Everything compiles ok, but i get a runtime exception on window.show What am i doing wrong?

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