Is there a way to change the properties of a ListviewItem when this one is selected?
As an example, I want that a rectangle inside the ListviewItem to be Red when s
You can set ListView.ItemContainerStyle to customize the style of ListViewItems used in the ListView.
This page shows the default style: https://msdn.microsoft.com/en-us/library/windows/apps/mt299136.aspx
In case of your example - you would change the Selected~Background properties in code similar to below: