Silverlight style trigger throwing error in blend

I am styling a listbox in silverlight and the trigger I am making will not work in Blend. Here is the code.

<Style TargetType="ListBoxItem" x:Key="ContainerStyle">
        <Style.Triggers>
            <Trigger Property="IsSelected" Value="True">
                <Setter Property="ContentTemplate" Value="{StaticResource SelectedTemplate}" />
            </Trigger>
        </Style.Triggers>
        &l开发者_开发知识库t;Setter Property="ContentTemplate" Value="{StaticResource ItemTemplate}" />
    </Style>

Blend just says "The member Triggers is not recognized or is not accessible.

That would be because the Style class does not have a Triggers collection. Only derivatives of FrameworkElement have a Triggers collection and in Silverlight only Loaded trigger is recognized.