How to remove "focused" border from XAML listbox? - xaml

Question

This problem is about the listbox itself and not it's cells. If I put listbox into a viewbox, and click on an item, the whole listbox will be surrounded with a 1px border. I do not want that, because it is ugly. How to remove this border?
Details:
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<Viewbox Grid.Row="1" Stretch="Uniform">
<StackPanel Orientation="Horizontal" Margin="0,20,0,20">
<Grid Width="200">
<ListBox ItemsSource="{Binding Rajzelemek}" Background="{x:Null}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<ContentControl Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" Content="{Binding Ikonja}" Width="25" Height="25" VerticalAlignment="Center" />
<TextBlock Text="{Binding}" VerticalAlignment="Center" Foreground="{ThemeResource ApplicationForegroundThemeBrush}" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Vertical" Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
</Grid>
</StackPanel>
</Viewbox>
</Grid>
If I comment the <Viewbox Grid.Row.... part, everything is fine, but not scaled. I want stuff to get scaled, well that is why I use the viewbox, but I do not want this border:
The code above was put on a metro BlankPage1 too, and made the same thing.

Answer 1

I think you're looking for what's in the ListBoxItem template wherein there's a Rectangle acting as a Focus Visual, if you check out the default template you'll see it with a default brush attributed to it (FocusVisualWhiteStrokeThemeBrush) which you could either change in the template, or provide your own resource for it to find before it hits the default dictionaries like;
<SolidColorBrush x:Key="FocusVisualWhiteStrokeThemeBrush" Color="Transparent" />
Hope this helps.
EDIT
Sorry I was going by the picture you have, thought it was the item. In any case since your ViewBox is the culprit you just need to interact with the Border control within it >like you showed in a previous post of your own< where you're the one making that border. Something like;
<Viewbox>
<Viewbox.Resources>
<Style TargetType="Border">
<Setter Property="BorderBrush" Value="Transparent" />
<Setter Property="BorderThickness" Value="0" />
</Style>
</Viewbox.Resources>
...
</ViewBox>