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use DisplayAlert in a TapGesture

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Hi.
I have a ViewCell with a Image.
The Image Has a TapGesture.
In the TapGesture.Tapped event I would like to do a question with a DisplayAlert, but I don't know how to do it.
Something like

var ret = DisplayAlert("Error", "Do you want to continue", "yes", "no");

DisplayAlert does not exist in "ViewCell" Level.

Can Someone help me?
Thanks
Alessandro


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