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    copied!<p>Try this:</p> <pre><code>&lt;Window.Resources&gt; &lt;SolidColorBrush x:Key="SelectedBackgroundBrush" Color="#DDD" /&gt; &lt;SolidColorBrush x:Key="DisabledForegroundBrush" Color="#888" /&gt; &lt;SolidColorBrush x:Key="DisabledBackgroundBrush" Color="#EEE" /&gt; &lt;!-- SimpleStyles: ListBoxItem --&gt; &lt;Style TargetType="ListBoxItem" x:Key="ListBoxItemTemplate"&gt; &lt;Setter Property="SnapsToDevicePixels" Value="true"/&gt; &lt;Setter Property="OverridesDefaultStyle" Value="true"/&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="ListBoxItem"&gt; &lt;Grid&gt; &lt;Rectangle x:Name="Rectangle" Fill="Transparent" Stroke="Black" StrokeDashCap="Square" StrokeThickness="0" SnapsToDevicePixels="True"&gt; &lt;Rectangle.StrokeDashArray&gt; &lt;sys:Double&gt;5&lt;/sys:Double&gt; &lt;/Rectangle.StrokeDashArray&gt; &lt;/Rectangle&gt; &lt;Border Name="Border" Padding="2" BorderThickness="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=BorderThickness}" BorderBrush="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=BorderBrush}"&gt; &lt;ContentPresenter /&gt; &lt;/Border&gt; &lt;/Grid&gt; &lt;ControlTemplate.Triggers&gt; &lt;Trigger Property="IsSelected" Value="true"&gt; &lt;Setter TargetName="Rectangle" Property="StrokeThickness" Value="1" /&gt; &lt;Setter TargetName="Border" Property="BorderThickness" Value="0" /&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsSelected" Value="true"&gt; &lt;Setter TargetName="Rectangle" Property="Fill" Value="{StaticResource SelectedBackgroundBrush}" /&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsEnabled" Value="false"&gt; &lt;Setter Property="Foreground" Value="{StaticResource DisabledForegroundBrush}" /&gt; &lt;/Trigger&gt; &lt;/ControlTemplate.Triggers&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;Style TargetType="{x:Type ListBoxItem}" BasedOn="{StaticResource ListBoxItemTemplate}"&gt; &lt;Setter Property="Height" Value="30" /&gt; &lt;Setter Property="BorderThickness" Value="0,0,0,1" /&gt; &lt;Setter Property="BorderBrush" Value="Silver" /&gt; &lt;Style.Triggers&gt; &lt;Trigger Property="ItemsControl.AlternationIndex" Value="3"&gt; &lt;Setter Property="BorderBrush" Value="Black"&gt;&lt;/Setter&gt; &lt;/Trigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; &lt;/Window.Resources&gt; &lt;StackPanel&gt; &lt;ListBox&gt; &lt;ListBoxItem Content="Item 1" /&gt; &lt;ListBoxItem Content="Item 2" /&gt; &lt;ListBoxItem Content="Item 3" /&gt; &lt;ListBoxItem Content="Item 4" /&gt; &lt;/ListBox&gt; &lt;/StackPanel&gt; </code></pre> <p>So I put a rectangle bellow the actual border in the control template. The rectangle can have its border be dotted, or dashed or w/e (to make the dash smaller just change the part to 2, 1 is not noticeable). So the default value of the rectangle's border thickness is 0, but when selected I set the thickness to 1 so it's visible. I made some border properties to be binded to its templated parent too, so it can look like what you set on your style (brush silver, thickness 0,0,0,1).</p>
 

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