Hi, I have a problem. I am new to WPF and I thought I could set a ContextMenu for my ListBox via a Style so I wrote sth like this: <Window x:Class="TestTheTestStudio.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="300" Width="300" Loaded="Window_Loaded"> <Window.Resources> <Style TargetType="{x:Type ListBox}"> <Setter Property="ContextMenu"> <Setter.Value> <ContextMenu Name="test"> <MenuItem Header="Test"/> </ContextMenu> </Setter.Value> </Setter> </Style> </Window.Resources> <StackPanel> <Button x:Name="buttonTest" Click="buttonTest_Click">Add</Button> <ListBox> <ListBox.Items> <ListBoxItem>Test</ListBoxItem> </ListBox.Items> </ListBox> </StackPanel> </Window> My code compiles. But after that I get a Exception from the XamlReader saying that a object of type "System.Object" must not have content of type "System.Windows.Controls.ContextMenu". I do not understand what I am doing wrong...maybe it is sth very simple. Thanks, Pan