I have searched for possible solutions for adding shadow effect and found the following discussions on the topic:
Basically, you would need to wrap the items' content inside a Frame and implement custom renderers for the Frame on iOS and Android where the shadow could be defined.
I have tried it with RadListView and the result was good, especially on iOS, on Android it should be further improved.
I have attached my test project here, so please download it and give it a try.
I hope this would help you get started with the implementation.
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