I'm not sure I understand your expression ...
If we use the field for the interval, we can see the space between but when we select any objects, the selection background will cover the space between the elements.
... since I just add Margin (say Margin = "10") only to the FIRST GridViewItem , and all subsequent elements are evenly distributed.
code snippet -
... <GridView>
<GridViewItem Margin="20" Width="100" Height="100">
<Image Source="Assets/SmallLogo.png"/>
</GridViewItem> ...
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