this is the function that manages the click

CarrsuelTestClick.cs

private async void Button_Clicked(object sender, EventArgs e)
        {
            var carousel = this.Content.FindByName<CarouselView>("MyCarrousel");
            var listOfControls = carousel.VisibleViews;
            var gridControl = listOfControls[0] as Grid;
            var controlsInsideGrid = gridControl.Children;

            var labelName = controlsInsideGrid[1] as Label;
            var button = controlsInsideGrid[2] as Button;

            button.BackgroundColor = Color.Blue;

            await DisplayAlert("Message", $"The displayed color is {labelName.Text}", "Ok");
        }