Hello Mano,

The RadListView provides styles; ItemStyle, SelectedItemStyle and PressedItemStyle. See the following documentation for guidance: Item Styles. You can even use a StyleSelector to choose a different style depending on a predefined condition, see ItemStyle Selector documentation.

If you're referring to having a completely different ItemTemplate, almost no ListView type of object provide different DataTemplate-based properties on the condition of selection. You'll instead need to create a Xamarin.Forms.DataTemplateSelector object and assign it to the RadLstView.ItemTemplateSelector property.  We have a tutorial on how to accomplish this in the following article: ItemTemplateSelector.

Once you've read that tutorial and are famliar with using a DataTemplateSelector, lets move on to the relevancy to changing a template based on selection. 

First, you'll need to sync a model boolean property to your data model if there isn't one yet (make sure you invoke PropertyChanged for this property):


Then, subscribe to the SelectionChanged event of the RadListView and toggle the data item's selected flag accordingly:


Finally, in the template selector, you can use this value to return the appropriate DataTemplate:



Regards,
Lance | Tech Support Engineer, Sr.
Progress Telerik