Silverlight ListBox Selection is not shown - silverlight

Question

My individual ListBox has two different ItemTemplates - which gone be chosen by a TemplateSelector.
This works fine and i have two different ItemTmplates shown up on the screen.
But what i dont have instead is a Selection. So i can't select an Item in the ListBox. With the Keyboard it works and you can select one.
Here is what my ContainserStyle looks like:
<Style x:Key="ListBoxItemStyleMain" TargetType="ListBoxItem">
<Setter Property="Padding" Value="5" />
<Setter Property="HorizontalContentAlignment" Value="Left" />
<Setter Property="VerticalContentAlignment" Value="Top" />
<Setter Property="Background" Value="Transparent" />
<Setter Property="BorderThickness" Value="1" />
<Setter Property="TabNavigation" Value="Local" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListBoxItem">
<Grid x:Name="grid" Background="{TemplateBinding Background}" RenderTransformOrigin="0.5,0.5">
<Grid.RenderTransform>
<CompositeTransform />
</Grid.RenderTransform>
<Grid.ColumnDefinitions>
<ColumnDefinition />
</Grid.ColumnDefinitions>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal" />
<VisualState x:Name="MouseOver">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="fillColor" Storyboard.TargetProperty="Opacity" Duration="0" To=".35" />
<DoubleAnimation Duration="0:0:0.3" To="1.1" Storyboard.TargetProperty="(UIElement.RenderTransform).(CompositeTransform.ScaleX)" Storyboard.TargetName="contentPresenter" d:IsOptimized="True"/>
<DoubleAnimation Duration="0:0:0.3" To="1.1" Storyboard.TargetProperty="(UIElement.RenderTransform).(CompositeTransform.ScaleY)" Storyboard.TargetName="contentPresenter" d:IsOptimized="True"/>
</Storyboard>
</VisualState>
<VisualState x:Name="Disabled">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="contentPresenter" Storyboard.TargetProperty="Opacity" Duration="0" To=".55" />
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="SelectionStates">
<VisualState x:Name="Unselected"/>
<VisualState x:Name="Selected">
<Storyboard>
<DoubleAnimation Duration="0" To=".75" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="fillColor2"/>
</Storyboard>
</VisualState>
<VisualState x:Name="SelectedUnfocused"/>
</VisualStateGroup>
<VisualStateGroup x:Name="FocusStates">
<VisualState x:Name="Focused">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="FocusVisualElement" Storyboard.TargetProperty="Visibility" Duration="0">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<Visibility>Visible</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Unfocused" />
</VisualStateGroup>
<VisualStateGroup x:Name="LayoutStates">
<VisualState x:Name="AfterLoaded"/>
<VisualState x:Name="BeforeLoaded"/>
<VisualState x:Name="BeforeUnloaded"/>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Rectangle x:Name="fillColor" Fill="{StaticResource SolidBrushSmarxGreen20}" IsHitTestVisible="False" Opacity="0" RadiusX="1" RadiusY="1" d:LayoutOverrides="GridBox" />
<Rectangle x:Name="fillColor2" Fill="{StaticResource SolidBrushSmarxGreen60}" IsHitTestVisible="False" Opacity="0" RadiusX="1" RadiusY="1" d:LayoutOverrides="GridBox" />
<ContentPresenter x:Name="contentPresenter" RenderTransformOrigin="0.5,0.5" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}">
<ContentPresenter.RenderTransform>
<CompositeTransform />
</ContentPresenter.RenderTransform>
</ContentPresenter>
<Rectangle x:Name="FocusVisualElement" RadiusX="1" RadiusY="1" Stroke="{StaticResource SolidBrushSmarxGreen60}" StrokeThickness="1" Visibility="Collapsed" d:LayoutOverrides="GridBox"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
So - as you can see, i have a Selected-State defined.
It's all default styling and Templating - except for the colors.
Thanks in any advice :)
regards
Mike

Answer 1

Found it out - it's really unclear why i don't get a selection. Because when i insert some Items with Content (which i haven't got at the moment), then the selection works fine.
The Selection State works anyway - but you have to click precisely on the Focus Border :)