Remove list box item dotted border

I have a custom styled ListBoxItem with a Border surrounding a ContentPresenter. (Code found below). My border acts as my selection indicator and turns grey when you select it. All is fine when I use the mouse, but the moment I use my keyboard, an ugly dotted grey border comes out. How do I remove it?

Pics:

You can see that when I mouse over/click on the ListBoxItem, a border with included background surrounds the item. But an ugly dotted border pops out when I use the keyboard.

Code:

<Style x:Key="{x:Type ListBoxItem}" TargetType="ListBoxItem" BasedOn="{StaticResource {x:Type ListBoxItem}}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="ListBoxItem">
                <StackPanel>
                    <Border Name="HighlightBorder"  
                            Padding="30"
                            BorderBrush="Transparent"
                            BorderThickness="1"
                            CornerRadius="5"
                            >
                            <ContentPresenter/>
                    </Border>
                </StackPanel>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsMouseOver" Value="True">
                        <Setter TargetName="HighlightBorder" Property="Background" Value="#F3F3F3"/>
                    </Trigger>
                    <Trigger Property="IsSelected" Value="True">
                        <Setter TargetName="HighlightBorder" Property="Background" Value="#DFDFDF"/>
                    </Trigger>
                    <Trigger Property="IsKeyboardFocused" Value="True">
                        <Setter TargetName="HighlightBorder" Property="Background" Value="#DFDFDF"/>
                    </Trig开发者_StackOverflow社区ger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>

From this answer by jobi-joy

<Style x:Key="ListBoxItemStyle1" TargetType="{x:Type ListBoxItem}"> 
   <Setter Property="FocusVisualStyle" Value="{x:Null}"/> ....